wip: example with svelte

[oliveriosousa]

• Adds a new example using js-ipfs with svelte

This example is still a WIP because of Rollup compatibility with IPFS. When bundling the project it throws the following error:

> example-browser-svelte@1.0.0 dev
> rollup -c -w

rollup v2.55.1
bundles src/main.js → public/build/bundle.js...

[rollup-plugin-svelte] The following packages did not export their `package.json` file so we could not check the "svelte" field. If you had difficulties importing svelte components from a package, then please contact the author and ask them to export the package.json file.

- multiformats
- merge-options
- @ipld/dag-pb
- @ipld/dag-cbor
- cborg
- parse-duration
- streaming-iterables
- @ipld/car
- ip-address

LiveReload enabled
(!) Circular dependencies
polyfill-node.global.js -> polyfill-node.global.js
polyfill-node._stream_duplex.js -> polyfill-node._stream_readable.js -> polyfill-node._stream_duplex.js
polyfill-node._stream_duplex.js -> polyfill-node._stream_writable.js -> polyfill-node._stream_duplex.js
node_modules/ipfs-bitswap/src/types/message/index.js -> node_modules/ipfs-bitswap/src/utils/index.js -> node_modules/ipfs-bitswap/src/types/message/entry.js -> node_modules/ipfs-bitswap/src/types/wantlist/index.js -> node_modules/ipfs-bitswap/src/types/message/index.js
node_modules/ipfs-bitswap/src/types/message/index.js -> node_modules/ipfs-bitswap/src/utils/index.js -> node_modules/ipfs-bitswap/src/types/message/entry.js -> node_modules/ipfs-bitswap/src/types/wantlist/index.js -> /Users/oliveriosousa/Projects/PL/js-ipfs-examples/examples/browser-svelte/node_modules/ipfs-bitswap/src/types/message/index.js?commonjs-proxy -> node_modules/ipfs-bitswap/src/types/message/index.js

To fix this error and to have just one source of truth any suggestion is welcome in the following PR: Rollup example (#7)

cc @hugomrdias @achingbrain