Adding security features

[Proxihox]

The current implementation has negligible security restrictions. Here are a few which are needed, feel free to suggest more:

1. Encrypt the users.pkl
2. When typing in password the characters are seen instead of ******** , needs to be updated.
3. Implement restrictions on the type of password users can setup.
4. Add a forgot password use email to recover option

[Sanchit9587]

I have implemented the first third and fourth feature.