extra info for development via minikube

kubernetes/MINIKUBE.md

@@ -0,0 +1,17 @@
+# Accessing OpenProject
+
+If the minikube tunnel doesn't work, find out the used OpenProject port via
+
+```
+kubectl --context minikube get services
+```
+
+and then open the tunnel yourself via
+
+```
+ssh -i $(minikube ssh-key) docker@localhost -p 60390 -L 8080:localhost:30265
+```
+
+to be able to access OpenProject under http://localhost:8080.
+
+60390 would be the minikube container's mapped ssh port which you can see via `docker ps`.