added README

Author: errnair

server_management/CentOS/nginx/README.md

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+#### Script to add a new user to an Nginx server
+
+The `newuser` script adds a new user to an Nginx server, and creates the appropriate directories, 
+sets the correct ownerships and permissions, so that content can be served from the user's home 
+directory, rather than the default Nginx location. Additionally, it creates a virtual environment 
+within the user's home directory and also copies a test index file to the new webroot. 
+ 
+*Requirements* 
+
+- `root` access to the Nginx webserver.
+- Python 3 (to create the virtual environment).