README.md in mautic-1.0.1 vs README.md in mautic-1.0.3

@@ -3,9 +3,16 @@
 
 ## Usage
 ### Gem provides API connection to your Mautic(s)
   1. Create mautic connection
   2. Authorize it
+      
+      In mautic you need add API oauth2 login.
+      For URI callback allow:
+      ```
+      http://localhost:3000/mautic/connections/:ID/oauth2
+      ```
+      ID = is your Mautic::Connection ID
   
    Find connection which you want to use:
   ```ruby
   m = Mautic::Connection.last
   ```