Add azd 🆙 to list of open-source projects

[kristenwomack]

The Azure Developer CLI (azd) is missing from the list of Microsoft open-source projects.

• add issue (per contributor guidelines)
• add azd and submit a PR

(you can assign this issue to me)

[jeffwilcox]

Very happy for any contributions! You can see some other examples at https://github.com/microsoft/opensource.microsoft.com/pulls?q=is%3Apr+is%3Aclosed+no%3Alabel