Fix part of #bug-60

[Khushi-24]

Issue-60 (Adding login with email functionality)

Explanation

Earlier the app consisted of login with google and GitHub functionality I have tried to add the login with email functionality

First user need to Register himself(UserId would be added to firebase) The user needs to log in. When a user tries to login for the first time he/she needs to verify email first. After email verification user can log in to the app.

Video:- https://user-images.githubusercontent.com/70067211/112765452-e6caab00-902a-11eb-87dd-db56b2aab58c.mp4

Explanation

Checklist

• [x] The PR title starts with "Fix #bugnum: ", followed by a short, clear summary of the changes. (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• [x] The PR explanation includes the words "Fixes #bugnum: ..." (or "Fixes part of #bugnum" if the PR only partially fixes an issue).
• [x] The PR does not contain any unnecessary auto-generated code from Android Studio.
• [x] The PR does not break any part of the existing code.
• [x] The PR creator have carefully read & adher to the contributing guidelines of the project.
• [x] The PR is made to the branch that's called "develop".
• [x] The PR is made from a branch that is up-to-date with "develop".

[Khushi-24]

Before implementing the code in the main app I had created a demo app. The code was working fine. When I implemented the code in the main app User is getting registered But the Toast message showing up is "Failed to Register! Try Again!". The code is the same as that of the demo app. Link: https://github.com/Khushi-24/Firebase-Email-authentication-Demo. @riturajjain2000 can you please guide me a bit about this.

[riturajjain2000]

I think that the problem is that your SHA keys are not added in my project , if not , Dm them over discord

[Khushi-24]

@riturajjain2000 I have made the required changes. Please review the PR. The toast message error is also solved.

[Khushi-24]

@riturajjain2000 Resolved Merge Conflicts