Adding reference docs + paramterized some environment variables + new firebase environments. + firebase ref docs.

_reference/firebase.md

@@ -0,0 +1,15 @@
+1. Create a new project
+2. Setup sign in methods to be user and email only.
+3. Update .env to include config. 
+4. Setup the Firebase CLI 
+   1. cd to client firebase at server directory.
+   2. ensure all dependencies installed 
+      1. $ npm install firebase-functions@latest firebase-admin@latest --save
+      2. $ npm install -g firebase-tools
+   3. $ firebase login //Login as needed. 
+5. Set the current projct
+   1. firebase use <projectname>
+6. Deploy the function
+   1. $ firebase deploy --only functions
+7. Add the allowed domains. 
+8. Update server variables including FIREBASE_ADMINSDK_JSON, FIREBASE_DATABASE_URL