adding contribute page on website.

[h4l0gen]

This will add contribute page with following content:

• Contributor workflow
• Your First Contribution (to fulfill CNCF assessment criteria)
• DCO
• TUF Repositories
• Slack channel
• Mailing list
• Community meeting
• Gvernance

It seems, I messed up config.toml file for reviewing 🥲. Let me clarify what I have done in config.toml file.

• I've added contribute page before Reporting issue page
• changed weights of order.
• I've removed previous Contribute page as it only redirects to python-tuf repo, and we want detailed contributing page.

Thanks for understanding and reviewing. 🙏

fixes #49

[h4l0gen]

@joshuagl @mnm678 @lukpueh As per this discussion, I've created contributing page that will resolve #49. This contributing page is based on CNCF assessment criteria. PTAL and provide your feedback. Thank you!

[h4l0gen]

@trishankatdatadog I think we should give link of contributing.md files too on contributing page, WYT? If you like, I will add contributing.md file for this repo, as python-tud already have CONTRIBUTING.md

[trishankatdatadog]

@trishankatdatadog I think we should give link of contributing.md files too on contributing page, WYT? If you like, I will add contributing.md file for this repo, as python-tud already have CONTRIBUTING.md

@joshuagl @mnm678 WDYT?