add entries for Apache Kafka and Apache Flink

[SamBarker]

Adding projects which the AMQ Streams team is actively contributing to.

Related issue

Testing instructions

Browser requirements (for page updates)

Your updates should work in the following environments:

• Latest 2 versions of Edge
• Internet Explorer 11 (should be useable, not pixel perfect)
• Latest 2 versions of Firefox (one on Mac OS, one of Windows OS)
• Firefox 68 (or latest version for Red Hat Enterprise Linux distribution)
• Latest 2 versions of Chrome (one on Mac OS, one of Windows OS)
• Latest 2 versions of Safari
• Android mobile device (such as the Galaxy S9)
• Apple mobile device (such as the iPhone X)
• Apple tablet device (such as the iPhone Pro)

Ready-for-merge Checklist

Check off items as they are completed. Feel free to delete items if they are not applicable.

• Expected files: all files in this pull request are related to one request or issue (no stragglers or scope-creep).
• Browser testing passed.
• Repository compiles.
• Documentation (README.md, etc.) updated or added.
• Approved by designer or writer (if applicable).

Merging

Please squash when merging and ensure your commit message uses conventional commit formatting.

[SamBarker]

@bproffitt is this something you can review?

[showuon]

LGTM! Thanks for adding the missing pieces!

[SamBarker]

thanks @bproffitt can you approve the PR to run through the workflows or point me at someone that can? I can't trigger them for this PR.