Add instructions on how to install the gem

README.md

@@ -4,6 +4,11 @@ This is the official OmniAuth strategy for authenticating to [Michigan State Uni
 use it, you'll need to sign up for an OAuth2 Application ID and Secret
 on the [MSUnet Applications Page](https://oauth.msu.edu/settings/applications).
 
+## Installation
+
+To install this gem you need to use:
+gem install omniauth-msunet --pre
+
 ## Basic Usage
 
     use OmniAuth::Builder do