Added Programiz PRO Community Challenges

[awalrujaa]

Programiz PRO Community Challenges allows users to practice the coding challenges of different difficulties for free.
As users can use the Community Challenges to practice coding for free, this will surely provide value to those looking for a free resource to practice challenges.

[mfaisalkhatri]

Please make sure you follow the guidenlines for merging in this repo

1. Raise an issue first for any update you need to make to this repo
2. Your commits needs to be signed and verified
3. The link you are adding should be updated under - Programming languages >> Python

[mfaisalkhatri]

closing the PR due to non-activity and no response.