added new readme file on how to do drf authorization

share/templates/readmes/drf_authorization_facebook.md

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+## main info
+
+https://medium.com/scalereal/the-ultimate-guide-to-using-social-login-in-django-f0abe0022ab0
+
+### facebook settings
+
+#### these settings are needed for csrf to work
+
+	ACCOUNT_DEFAULT_HTTP_PROTOCOL='https'
+
+[source for account default setting](https://stackoverflow.com/questions/55666103/django-allauth-facebook-integration-login-failure)
+
+	CSRF_TRUSTED_ORIGINS = ['https://oauth.drftesting.net']
+	ALLOWED_HOSTS = ['https://oauth.drftesting.net']
+
+#### settings in facebook developer apps
+
+##### in app settings / basic
+
+app settings->basic
+
+###### app domains
+
+add the top level domain and the full domain. should look like
+
+	drftesting.net
+	oauth.drftesting.net
+
+go a little further down and click on the button that says "add platform"
+
+###### Site URL
+put the full site url in with "https"
+
+	https://oauth.drftesting.net/
+
+##### under products
+
+products->facebook login->configure (dropdown) -> settings
+
+set Embedded Browser OAuth Login to yes
+
+##### in Valid OAuth Redirect URIs add the callback url:
+
+example url:
+ 
+	https://oauth.drftesting.net/accounts/facebook/login/callback/
+
+######source on creating and setting up a facebook app
+ [configure facebook login](https://help.sharetribe.com/en/articles/666072-configure-facebook-login)
+
+######django alluth doc on how to configure callback
+ [django allauth callback](https://django-allauth.readthedocs.io/en/latest/socialaccount/providers/index.html?highlight=callback)
+
+
+
+