Add Github auth urls to readme

Author: hrishimittal

README.md

@@ -24,11 +24,15 @@ foreman start -f Procfile.dev
 
 ## Github Authentication
 
-We use Github for authentication. So you will need to register a new OAuth application on Github.
+We use Github for authentication. So you will need to [register a new OAuth application on Github](https://github.com/settings/applications/new).
 
 Please make sure you set the authorization callback URL correctly. With the default devise and omniauth settings, add `/users/auth/github/callback` to your root URL.
 
-For example, here are the settings for an app running on localhost port 3000:
+For example, in development, if your app is running on localhost port 3000, then the URL settings will be:
+
+Homepage URL: `http://localhost:3000`
+
+Authorization callback URL: `http://localhost:3000/users/auth/github/callback`
 
 Once you've set up your Github app, Github will provide you with a Client ID and secret. You need to add these to your app's environment as `GITHUB_APP_ID` and `GITHUB_APP_SECRET`.