Created Some Model class and CRUD operation for Event and User entity

[roshanbasnet]

Summary

Implement User and Event models with SQLModel and corresponding Pydantic schemas.

Changes

• Created user.py to define the User model using SQLModel.
• Created event.py to define the Event model using SQLModel.
• Created userschema.py to define Pydantic schemas for User.
• Created eventschema.py to define Pydantic schemas for Event.
• Setup DB connection

Please @bjupreti review and provide feedback

[bjupreti]

I think databasedb/karyakram.db shouldn't be committed in git. Later, we will be using RDS but even for now, I don't think we should commit databases in git.

Are you able to call events API and get back the response? When I tried to run it in my local machine I got so many import errors. Do you think it will be good if we do absolute imports like shown in below ss?

[bjupreti]

Looks good to me