Document compatibility with k8s.io/*, client-go and Go

Signed-off-by: Stefan Büringer [email protected]

README.md

@@ -18,6 +18,26 @@ export `GO111MODULE=on`.
 
 See [VERSIONING.md](VERSIONING.md).
 
+
+## Compatibility
+
+Every minor version of controller-tools has been tested with a specific minor version of client-go. A controller-tools minor version *may* be compatible with
+other client-go minor versions, but this is by chance and neither supported nor tested. In general, we create one minor version of controller-tools
+for each minor version of client-go and other k8s.io/* dependencies.
+
+The minimum Go version of controller-tools is the highest minimum Go version of our Go dependencies. Usually, this will
+be identical to the minimum Go version of the corresponding k8s.io/* dependencies.
+
+Compatible k8s.io/*, client-go and minimum Go versions can be looked up in our [go.mod](go.mod) file.
+
+|          | k8s.io/*, client-go | minimum Go version |
+|----------|:-------------------:|:------------------:|
+| CR v0.16 |        v0.31        |        1.22        |
+| CR v0.15 |        v0.30        |        1.22        |
+| CR v0.14 |        v0.29        |        1.20        |
+| CR v0.13 |        v0.28        |        1.20        |
+| CR v0.12 |        v0.27        |        1.20        |
+
 ## Community, discussion, contribution, and support
 
 Learn how to engage with the Kubernetes community on the [community page](http://kubernetes.io/community/).