feat: add minimal UI for sending and receiving messages

Milton Moura (Nordeck)requested to merge
mgcm/poc/krems-hackathon into develop

Issue: addresses both planning#169 and planning#205

Implements an OIDC Auth Flow and the sending / receiving of messages in a non-encrypted room.

See the README.md on how to run the demo showcase.

Edited by Milton Moura (Nordeck)

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