Format README, Add Verify Config & Restart Nginx Command.

@alrra Here's the new PR with all the changes. Ref: #45
There's an extra "t" here. 

I think it would be useful to mention that you can do:

    nginx -t -c nginx.conf

i.e. at least hint/suggest that you can test your config changes (by pointing at any config file) without modifying your run-time config.