Feat user registration #50

[maxCastro1]

Implement User Registration Feature

This pull request implements the user registration feature for the e-commerce platform. It allows users to sign up as either a vendor or a buyer and captures relevant information such as name, email, password, and any additional details required for each user type.

What does this pull request do?

• Implements a user registration API endpoint.
• Validates user input (e.g., email, password, user type).
• Checks for existing users (email uniqueness).
• Hashes and stores user passwords securely using bcrypt.
• Creates user records in the database with appropriate user types (vendor or buyer).
• Returns appropriate success or error responses.