Authentication

Added JWT-token generation and verification into backend. When a user logs in or signs up it should generate a token.

requested review from @vildemv

assigned to @tinit

added 8 commits

• 9e66b0ca...6dd490d7 - 7 commits from branch main
• 1050a309 - Merge branch 'main' into 'authentication'

Compare with previous version

merged

mentioned in commit 81383f92