Retain the previous state of the new user creation form

[ebtihaj-khan]

• [x] Retain the previous information submitted through the form
• [x] Show password mismatch error before submission (do not let the user submit if the passwords do not match)
• [x] Show password creation rules before submission
• [x] Add validation to the email field. (do not let the user submit if the email is invalid)
• [x] Give the user an option to view the password