Readme: Add a warning about consuming from main
After removing the configmap, there were a few users complaining about
metallb not working anymore, mostly because they were consuming the main
branch. Here we add a note to warn about consuming main.
@@ -10,6 +10,13 @@ routing protocols.
Check out [MetalLB's website](https://metallb.universe.tf) for more
information.
+# WARNING
+
+Although the main branch has been relatively stable in the past, please be aware that it is the development branch.
+
+Consuming manifests from main may result in unstable / non backward compatible deployments. We strongly suggest consuming a stable branch, as
+described in the [official docs](https://metallb.universe.tf/installation/).
+
# Contributing
We welcome contributions in all forms. Please check out
