doc(readme): Add Midokura notes about this repo (#50)

README.md

@@ -1,3 +1,18 @@
 # Kubernetes resources configuration for ThingsBoard
 
-Here you can find scripts for deployment on different Kubernetes platforms.
+Here you can find scripts for deployment on different Kubernetes platforms.
+
+# Midokura notes
+
+This fork is expected to be in sync with [Thingsboard upstream](https://github.com/thingsboard/thingsboard).
+
+Most of Midokura changes will be related to the official Midokura way to deploy
+Thingsboard that is Helm chart (code inside `helm/` directory).
+
+Code for other deployments (`aws/`, `azure/`, `gcp`, `minikube`, `openshift`
+and maybe others in the future) WILL NOT include Midokura specific changes, and
+it is just left here to make upstream syncing easier.
+
+If you are a Midokura engineer you SHOULD use only the contents in `helm/`
+directory. Other options may miss important changes for production environment
+and should be avoided.