Changed title of adding new repo and existing repo windows to be more user-friendly and informative

[SAMAD101]

Related Issue

#issue1807

Motivation and Context

thought it would be a better to give these windows better titles

Screenshots (if appropriate):

####New repo window:

####Existing repo window:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x ] I have read the CONTRIBUTING guide.
• [ x] My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

I provide my contribution under the terms of the license of this repository and I affirm the Developer Certificate of Origin.

[m3nu]

While small changes add up, we're also happy to see non-trivial contributions.