For Authentication

[Saigenix]

[wavinamayola]

we could use https://github.com/golang-jwt/jwt for auth

[Amirth24]

Lets make decision based on the http framework we choose.

[Amirth24]

I am willing to work this issue, I can write the middleware and handlers required for the authentication. For now I'll write only the middleware and part of the handler, since it requires the user service.

Also If we are to implement oauth2, what providers should we be using ? List it (Maybe we can create separate issues for them)