examples: add basic pubsub-with-rendezvous example (#1738)

* Added basic pubsub with rendezvous example

* Formatting

* Appease go vet and dep checker

* tidy go mod

examples/pubsub/basic-chat-with-rendezvous/.gitignore

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+chat

examples/pubsub/basic-chat-with-rendezvous/README.md

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+# go-libp2p-pubsub chat with rendezvous example
+
+This example project allows multiple peers to chat among each other using go-libp2p-pubsub. 
+
+Peers are discovered using a DHT, so no prior information (other than the rendezvous name) is required for each peer.
+
+## Running
+
+Clone this repo, then `cd` into the `examples/pubsub/basic-chat-with-rendezvous` directory:
+
+```shell
+git clone https://github.com/libp2p/go-libp2p
+cd go-libp2p/examples/pubsub/basic-chat-with-rendezvous
+```
+
+Now you can either run with `go run`, or build and run the binary:
+
+```shell
+go run .
+
+# or, build and run separately
+go build .
+./chat
+```
+
+To change the topic name, use the `-topic` flag:
+
+```shell
+go run . -topic=adifferenttopic
+```
+
+Try opening several terminals, each running the app. When you type a message and hit enter in one, it
+should appear in all others that are connected to the same topic.
+
+To quit, hit `Ctrl-C`.
+

examples/pubsub/basic-chat-with-rendezvous/go.mod

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+module github.com/libp2p/go-libp2p/examples/pubsub/chat
+
+go 1.18
+
+require (
+ github.com/libp2p/go-libp2p v0.22.0
+ github.com/libp2p/go-libp2p-kad-dht v0.18.0
+ github.com/libp2p/go-libp2p-pubsub v0.7.1
+)
+
+require (
+ github.com/benbjohnson/clock v1.3.0 // indirect
+ github.com/beorn7/perks v1.0.1 // indirect
+ github.com/cespare/xxhash/v2 v2.1.2 // indirect
+ github.com/cheekybits/genny v1.0.0 // indirect
+ github.com/containerd/cgroups v1.0.4 // indirect
+ github.com/coreos/go-systemd/v22 v22.3.2 // indirect
+ github.com/davidlazar/go-crypto v0.0.0-20200604182044-b73af7476f6c // indirect
+ github.com/decred/dcrd/dcrec/secp256k1/v4 v4.1.0 // indirect
+ github.com/docker/go-units v0.4.0 // indirect
+ github.com/elastic/gosigar v0.14.2 // indirect
+ github.com/flynn/noise v1.0.0 // indirect
+ github.com/francoispqt/gojay v1.2.13 // indirect
+ github.com/fsnotify/fsnotify v1.5.4 // indirect
+ github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
+ github.com/godbus/dbus/v5 v5.1.0 // indirect
+ github.com/gogo/protobuf v1.3.2 // indirect
+ github.com/golang/protobuf v1.5.2 // indirect
+ github.com/google/gopacket v1.1.19 // indirect
+ github.com/google/uuid v1.3.0 // indirect
+ github.com/gorilla/websocket v1.5.0 // indirect
+ github.com/hashicorp/errwrap v1.0.0 // indirect
+ github.com/hashicorp/go-multierror v1.1.1 // indirect
+ github.com/hashicorp/golang-lru v0.5.4 // indirect
+ github.com/huin/goupnp v1.0.3 // indirect
+ github.com/ipfs/go-cid v0.2.0 // indirect
+ github.com/ipfs/go-datastore v0.5.1 // indirect
+ github.com/ipfs/go-ipfs-util v0.0.2 // indirect
+ github.com/ipfs/go-ipns v0.2.0 // indirect
+ github.com/ipfs/go-log v1.0.5 // indirect
+ github.com/ipfs/go-log/v2 v2.5.1 // indirect
+ github.com/ipld/go-ipld-prime v0.9.0 // indirect
+ github.com/jackpal/go-nat-pmp v1.0.2 // indirect
+ github.com/jbenet/go-temp-err-catcher v0.1.0 // indirect
+ github.com/jbenet/goprocess v0.1.4 // indirect
+ github.com/klauspost/compress v1.15.4 // indirect
+ github.com/klauspost/cpuid/v2 v2.1.0 // indirect
+ github.com/koron/go-ssdp v0.0.3 // indirect
+ github.com/libp2p/go-buffer-pool v0.1.0 // indirect
+ github.com/libp2p/go-cidranger v1.1.0 // indirect
+ github.com/libp2p/go-flow-metrics v0.1.0 // indirect
+ github.com/libp2p/go-libp2p-asn-util v0.2.0 // indirect
+ github.com/libp2p/go-libp2p-blankhost v0.4.0 // indirect
+ github.com/libp2p/go-libp2p-core v0.20.0 // indirect
+ github.com/libp2p/go-libp2p-discovery v0.7.0 // indirect
+ github.com/libp2p/go-libp2p-kbucket v0.4.7 // indirect
+ github.com/libp2p/go-libp2p-record v0.2.0 // indirect
+ github.com/libp2p/go-libp2p-swarm v0.11.0 // indirect
+ github.com/libp2p/go-msgio v0.2.0 // indirect
+ github.com/libp2p/go-nat v0.1.0 // indirect
+ github.com/libp2p/go-netroute v0.2.0 // indirect
+ github.com/libp2p/go-openssl v0.1.0 // indirect
+ github.com/libp2p/go-reuseport v0.2.0 // indirect
+ github.com/libp2p/go-yamux/v3 v3.1.2 // indirect
+ github.com/lucas-clemente/quic-go v0.28.1 // indirect
+ github.com/marten-seemann/qtls-go1-16 v0.1.5 // indirect
+ github.com/marten-seemann/qtls-go1-17 v0.1.2 // indirect
+ github.com/marten-seemann/qtls-go1-18 v0.1.2 // indirect
+ github.com/marten-seemann/qtls-go1-19 v0.1.0 // indirect
+ github.com/marten-seemann/tcp v0.0.0-20210406111302-dfbc87cc63fd // indirect
+ github.com/mattn/go-isatty v0.0.16 // indirect
+ github.com/mattn/go-pointer v0.0.1 // indirect
+ github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+ github.com/miekg/dns v1.1.50 // indirect
+ github.com/mikioh/tcpinfo v0.0.0-20190314235526-30a79bb1804b // indirect
+ github.com/mikioh/tcpopt v0.0.0-20190314235656-172688c1accc // indirect
+ github.com/minio/sha256-simd v1.0.0 // indirect
+ github.com/mr-tron/base58 v1.2.0 // indirect
+ github.com/multiformats/go-base32 v0.0.4 // indirect
+ github.com/multiformats/go-base36 v0.1.0 // indirect
+ github.com/multiformats/go-multiaddr v0.6.0 // indirect
+ github.com/multiformats/go-multiaddr-dns v0.3.1 // indirect
+ github.com/multiformats/go-multiaddr-fmt v0.1.0 // indirect
+ github.com/multiformats/go-multibase v0.1.1 // indirect
+ github.com/multiformats/go-multicodec v0.5.0 // indirect
+ github.com/multiformats/go-multihash v0.2.1 // indirect
+ github.com/multiformats/go-multistream v0.3.3 // indirect
+ github.com/multiformats/go-varint v0.0.6 // indirect
+ github.com/nxadm/tail v1.4.8 // indirect
+ github.com/onsi/ginkgo v1.16.5 // indirect
+ github.com/opencontainers/runtime-spec v1.0.2 // indirect
+ github.com/opentracing/opentracing-go v1.2.0 // indirect
+ github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
+ github.com/pkg/errors v0.9.1 // indirect
+ github.com/polydawn/refmt v0.0.0-20190807091052-3d65705ee9f1 // indirect
+ github.com/prometheus/client_golang v1.12.2 // indirect
+ github.com/prometheus/client_model v0.2.0 // indirect
+ github.com/prometheus/common v0.37.0 // indirect
+ github.com/prometheus/procfs v0.8.0 // indirect
+ github.com/raulk/go-watchdog v1.3.0 // indirect
+ github.com/spacemonkeygo/spacelog v0.0.0-20180420211403-2296661a0572 // indirect
+ github.com/spaolacci/murmur3 v1.1.0 // indirect
+ github.com/whyrusleeping/go-keyspace v0.0.0-20160322163242-5b898ac5add1 // indirect
+ github.com/whyrusleeping/timecache v0.0.0-20160911033111-cfcb2f1abfee // indirect
+ go.opencensus.io v0.23.0 // indirect
+ go.uber.org/atomic v1.10.0 // indirect
+ go.uber.org/multierr v1.8.0 // indirect
+ go.uber.org/zap v1.22.0 // indirect
+ golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e // indirect
+ golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect
+ golang.org/x/net v0.0.0-20220812174116-3211cb980234 // indirect
+ golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4 // indirect
+ golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab // indirect
+ golang.org/x/tools v0.1.12 // indirect
+ google.golang.org/protobuf v1.28.1 // indirect
+ gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
+ lukechampine.com/blake3 v1.1.7 // indirect
+)