Add enterprise url to readme

Author: machadoit

README.md

@@ -36,6 +36,13 @@ Then set it in your terminal, replacing %Project_Token% with your own token:
 export CODACY_PROJECT_TOKEN=%Project_Token%
 ```
 
+**Enterprise**
+
+To send coverage in the enterprise version you should:
+```
+export CODACY_API_BASE_URL=<Codacy_instance_URL>:16006
+```
+
 By default this plugin will not submit results if you run your tests in localhost. If you want to force the submission you can setup the following environment variable:
 
 ```