#85-Add Sign-Up Link to Sign-In Page-RabiaAvci

[RbAvci]

Related to

Make sure you include the issue number with a hash sign # so Github can link this PR to the right issue, like this:

Fixes #85

Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have carefully reviewed my own code
• [ ] I have commented my code
• [ ] I have updated any documentation