docs(README): add example

README.md

@@ -7,3 +7,15 @@ goal of this project is to package the binary `docker-compose` as container imag
 found in the upstream project of [docker/compose](https://github.com/docker/compose).
 
 The workflow or how `docker-compose` can in general be used is documented [here](https://docs.docker.com/compose/).
+Nevertheless, here are some examples of how to use the container image.
+
+```bash
+IMAGE_VERSION=2.34.0
+docker run \
+  --rm \
+  --volume ./path/to/docker-compose.yml:/workdir/docker-compose.yml:ro \
+  --volume /var/run/docker.sock:/var/run/docker.sock \
+  --workdir /workdir \
+    git.cryptic.systems/volker.raschek/docker-compose:${IMAGE_VERSION} \
+      ps
+```

renovate.json

@@ -1,5 +1,16 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "customManagers": [
+    {
+      "fileMatch": ["^README\\.md$"],
+      "matchStrings": [
+        "VERSION=(?<currentValue>.*)"
+      ],
+      "depNameTemplate": "volker.raschek/docker-compose",
+      "datasourceTemplate": "docker",
+      "registryUrlTemplate": "https://git.cryptic.systems"
+    }
+  ],
   "extends": [
     "local>volker.raschek/renovate-config:default#master",
     "local>volker.raschek/renovate-config:container#master",