update readme

Author: fdlamotte

README.md

@@ -4,12 +4,14 @@ mccli.py : CLI interface to MeschCore companion app over BLE, TCP or Serial
 
 ## Install
 
-You should install meshcore package first via pip
+You should install (meshcore)[https://github.com/fdlamotte/meshcore_py] package first via pip.
 
  <pre>
 $ pip install meshcore
 </pre>
 
+Then you can put `mccli.py` program in your path.
+
 ## Usage
 
 <pre>