Mail implementation for sign-up, reset-password, update password

[denizparlak1]

Implement Postmark 3th party SMTP service for sending information from the welcome, password reset, and password change APIs.

[denizparlak1]

Created postmark template for;

• /create-user/
• /reset-password/
• /update-password/

[denizparlak1]

Implemented welcome , reset password and update password api

[denizparlak1]

• Implement reset and update password api for software admin.
• Implement reset and update password api for organization admin
• Implement reset and update password api for organization user