add useful references to the plan

plan

@@ -1,8 +1,8 @@
 pup.cloud Download
 components
-- web frontend
+- web frontend (Flask)
 - message queue + k/v store (redis)
-- task processor(s)
+- task processor(s) (Flask-RQ2 workers)
 
 web frontend:
 ? python+flask+rq+openid or saml
@@ -15,6 +15,7 @@ public routes:
 private routes:
 - GET / -> 200 index
 - GET /add -> 200 add_page
+- GET /.rq -> rq-dashboard
 
 api routes:
 - GET /api/v1/queue -> 200 queue_list (application/json) (list queue)
@@ -27,3 +28,10 @@ api routes:
 
 - GET /api/v1/id/logout -> 302 pup.cloud Identify SLO
 - GET /api/v1/id/user -> 200 userdata (application/json) (list basic user information)
+
+documentation references:
+rq: https://github.com/rq/rq
+flask example project: https://realpython.com/flask-by-example-part-1-project-setup/
+flask mega-tutorial (one chapter goes into flask-rq2 usage): https://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world
+flask-rq2 usage and reference: https://flask-rq2.readthedocs.io/en/latest/
+youtube-dl emedded usage: https://github.com/ytdl-org/youtube-dl/blob/master/README.md#embedding-youtube-dl