Added link to firebase example with RunKit

Author: Mike Kari Anderson

README.md

@@ -85,7 +85,10 @@ var Database = require('database-js2').Connection;
 
 #### Firebase Example
 The username and password is not the Firebase account holder's email and password. These are the login credentials for an authorized user of the Firebase data. Currently the wrapper only supports [email sign in methods](https://firebase.google.com/docs/auth/web/password-auth).
+
 This example is live, but read-only, if you install the normal [Firebase](https://www.npmjs.com/package/firebase) package, you can use the API key and credentials below to examine the data the Firebase way and compare it to this SQL wrapper.
+
+Try this in the [browser with RunKit](https://runkit.com/embed/00z4s0ylyx82)
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 var Database = require('database-js2').Connection;