Add K8s project in SIGs' table

[ChrsMark]

Prior to merging this PR we need to ensure the following:

• Create slack channel
• Create Google doc for agenda
• Create a calendar event + zoom meeting

Related to #2352

[trask]

Prior to merging this PR we need to ensure the following:

• Create slack channel
• Create Google doc for agenda
• Create a calendar event + zoom meeting

working on this now...

[trask]

Here's the new Slack Channel: #otel-k8s-semconv-sig

and it has the initial set of Slack Channel managers:

• @ChrsMark
• @dashpole
• @jsuereth
• @AlexanderWert

Check out How to setup new slack channel for recommended next steps.

Here's a blank Google doc with the correct permissions set up: https://docs.google.com/document/d/17DqFVlLvO43neXXTwlSd1zcKjSRA8P3d0Y444QNwUTQ/edit

And the event is on the public calendar (with new zoom link for the SIG), biweekly alternating with the Prometheus SIG. If you'd like access to update the calendar, follow the steps here and ping me on Slack so I can approve your membership request (we often miss these).

Please double check everything and let me know if anything is amiss, thanks!

[ChrsMark]

Thank's for setting these @trask! Everything looks good to me, we just need to fix the meeting's duration to 30 minutes instead of 1 hour. I hadn't mentioned that explicitly but it's what we use in System Metrics SIG and should be fine at least initially. If we see the need later to extend we can discuss it but let's not occupy more time in the calendar for now.

[ChrsMark]

Time slot has been fixed to 30 mins 👍🏽