docs(README): add more info

Author: woile

README.md

@@ -1,13 +1,15 @@
 # dam
 
-Python Stream Processing toolkit
+> Python Stream Processing minimalistic toolkit
 
 :warning: WARNING :warning:
 
 _This repo is highly experimental and it's not recommended for production use._
 
 _The interface may change at any time during initial development._
 
+_Still not published to pypi._
+
 ```python
 import asyncio
 from dam import App, Topic