Update README

README.md

@@ -2,4 +2,29 @@
 
 This repo keeps different rabbitmq agents that help in account creation on OHPC system.
 
-It has 2 branches ```develop``` and ```production``` , that houses agents based on where they are launched
+It has 2 branches ```develop``` and ```production``` , that house agents based on where they are launched
+
+## Using RCRMQ class
+
+- First, rename `rabbitmq_config.py.example` to `rabbitmq_config.py`
+
+- Modify config file, at least the `Password` needs to be your own passwod
+
+- In your code:
+
+```
+# import the class
+from rc_rmq import RCRMQ
+
+# instantiate an instance
+rc_rmq = RCRMQ({'exchange': 'RegUsr'})
+
+# publish a message to message queue
+rc_rmq.publish_msg({
+  'routing_key': 'your_key',
+  'msg': {
+    'type': 'warning',
+    'content': 'this is warning'
+  }
+})
+```