Build an app that uses the API

[Yarden-zamir]

CLI or maybe a simple compose app (those I think I can write quite fast) depends on time

[Yarden-zamir]

• [x] Add message
• [x] Delete message
• [x] Update message
• [x] Retrieve all messages
• [x] Retrieve message
• [x] Retrieve field from message
• [x] Retrieve logic fields from message
• [x] Retrieve logic field from message