Add doc for How to Configure Facebook Login (#1333)

Author: brianpchsu

docs/recipes/how-to-configure-facebook-login.md

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+How to configure Facebook Login
+
+1. Navigate and Login to https://developers.facebook.com/apps
+2. Click "Add New App"
+3. Enter your app name and contact email
+4. In App Dashboard, click `Set Up` in Facebook Login section
+5. Chose "Web" as your Platform
+6. Set Site URL to `http://localhost:3000/` for local testing. (Port of your Node server, not the port of the BrowserSync proxy)
+7. Click Facebook Login on the left panel
+8. Turn on Client OAuth Login and Web OAuth Login. Enter `http://localhost:3001/login/facebook/return` for Valid OAuth redirect URIs.
+9. Get your App ID and Secret and copy it to [`src/config.js`](../src/config.js)