[BE|UI] Create test accounts and rooms at serverside and use them in demo chats and video

[ro-jar]

depends on #11, #13, #10, #18

• Task 1: [BE] create db script for initializing test data.
• Task 2: [BE] create 2-3 test patient accounts and 2-3 test doctors. Hardcoded login and fixed test pswd
• Task 3: [BE] for test accounts create hardcoded rooms for chats and video calls. for all pairs of test patients and doctors shall be created initial chats (patient said: Hi -> doctor answered: Hi ) to be able to continue test dialog or making a call
• Task 4: [UI] on the demo login page list of test accounts shall be shown (like in initial demo). End user can login via test login and fixed password using login form, or select test account from the list and in that case app prefill form and submit
• Task 5: [UI] test patient shall see list of chatrooms with test doctors (created in Task 3 ) and be able to start video call. THe same with test doctors - they shall see list of chats with all trest patients
• Task 6: [UI] optional if TelemedDevGroup/Telemed-PoC-for-CraftRx#4 is ready using UI from TelemedDevGroup/Telemed-PoC-for-CraftRx#1 to support chats via backend TelemedDevGroup/Telemed-PoC-for-CraftRx#4

[ro-jar]

.

[itechart-scala-lab]

Child ticket for tasks 1,2,4 is created: https://github.com/ro-jar/Telemed-PoC-for-CraftRx/issues/15

[ykorobitsin]

backend for video room joining has been created in https://github.com/TelemedDevGroup/TelemedProtoApp/issues/18