Update readme

README.md

@@ -6,6 +6,40 @@ A `kubectl` plugin for creating `SopsSecret` resources.
 
 See https://github.com/craftypath/sops-operator.
 
-----
+The plugin automatically encrypts data using [Mozilla SOPS](https://github.com/mozilla/sops) and wraps them into a `SopsSecret`.
+The interface is the same as that of `kubectl create secret`.
 
-work in progress...
+## Installation
+
+Download a release for your platform and add it to the `PATH`.
+A distribution via [Krew](https://krew.sigs.k8s.io/) is planned.
+
+## Examples
+
+### From literal values
+
+```console
+kubectl sops create secret generic test-secret --from-literal foo=foo_secret --from-literal bar=bar_secret
+```
+
+### From file
+
+```console
+kubectl sops create secret generic test-secret --from-file test.yaml
+```
+
+### From file printing resulting YAML without applying it
+
+```console
+kubectl sops create secret generic test-secret --from-literal foo.yaml="bar: barvalue" --dry-run -o yaml
+```
+
+### With additional parameters for SOPS
+
+* Useful if no `.sops.yaml` is used
+* Args after the `--` delimiter are passed to SOPS
+
+```console
+kubectl sops create secret generic test-secret --from-file test.yaml -- \
+    --kms arn:aws:kms:eu-central-1:123456789012:key/ffad06af-a6cc-43e5-ad61-51db75d17c77
+```