feat: Add github-green-purple theme

[pushpak-256]

This theme is suitable for dark theme github, with green purple colors and white text for info.

Description

Fixes #

Type of change

• Updated documentation (updated the readme, templates, or other repo files)

How Has This Been Tested?

• Tested with a valid username
• Tested with an invalid username

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have made corresponding changes to the documentation

Screenshots

[DenverCoder1]

Thanks, in order to support the theme, you'll need to add it to themes.php. Please see issue #32 for details.

You probably want to copy the entry for chartreuse-dark to the end of the file and replace CurrStreakNum and CurrStreakLabel with #800080

Also, the docs should have a static image for example,

https://user-images.githubusercontent.com/20955511/173238945-f572fdfb-dbf6-4141-8ee6-b70f6186548e.png

[pushpak-256]

• Was trying to run this app locally by installing php , to get img, but having some troubles
• But, Ive updated things that you asked

[DenverCoder1]

Looks great! Thanks for the contribution 🎉