Add Meetup page (#2398)

* Add Meetup page

* Remove trailing white space

* Update meetup page title, description, links and look/feel

* Change Meetup page weight to to 30 and add "Tracking the Bitcoin ledger" demo video

* Add sentence to catch with past events linking to the YT playlist

community/meetup/README.md

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+Welcome to the Knative Community Meetup page!
+
+The virtual event is designed for end users, a space for our community to meet, get to know each other, and learn about uses and applications of Knative.
+
+Catch up with past community meetups on our [YouTube channel](https://www.youtube.com/playlist?list=PLQjzPfIiEQLLyCyLBKLlwDLfE_A-P7nyg).
+
+Here we will list all the information related to past and future events.
+
+Stay tuned for new events by subscribing to our [calendar](https://calendar.google.com/calendar/embed?src=google.com_18un4fuh6rokqf8hmfftm5oqq4%40group.calendar.google.com) ([iCal export file](https://calendar.google.com/calendar/ical/google.com_18un4fuh6rokqf8hmfftm5oqq4@group.calendar.google.com/public/basic.ics)) and following us on [Twitter](https://twitter.com/KnativeProject).
+
+---
+
+### 2020-04-16 – Knative Community Meetup #1
+Video: https://www.youtube.com/watch?v=k0QJEyV4U-4
+
+Agenda:
+- Welcome! (5’)
+  - Announce recording of meeting.
+- Update from the Steering Committee (5’)
+  - TOC election announcement (Brenda Chan)
+- Working groups updates (15’-20’)
+  - Eventing (Aleksander Slominski and Davy Odom)
+  - Networking (Nghia Tran)
+  - Operation (Vincent Hou)
+  - Client (Roland Huss)
+- [Demo - "Tracking the Bitcoin ledger" - by Johana Saladas (IBM) (30’)](https://www.youtube.com/watch?v=sGi_LuAaaT0)
+- Demo discussion / conversation (15’-20’)
+- Close (5’)
+  - Take the [survey](https://docs.google.com/forms/d/e/1FAIpQLSebw2IOjmnStiUhPpnndpjyuBUoziZOw9PK9fnJeFBQX0QxWw/viewform)! (it’s good karma)
+
+The demo for this first community meetup is "Tracking the Bitcoin ledger", designed and carried out by @josiemundi, software engineer at IBM. Thank you for volunteering, Johana!
+
+Here are the resources from the demo:
+- https://github.com/josiemundi/knative-eventing-blockchain-demo
+- https://github.com/josiemundi/knative-bitcoin-websocket-eventsource

community/meetup/_index.md

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+---
+title: "Knative Community Meetup"
+linkTitle: "Community Meetup"
+weight: 30
+type: "docs"
+---
+
+{{% readfile file="README.md" %}}