docs: Add a documentation Section in the README.md

### Is your feature request related to a problem?

Add a section in README.md which directs us to the wiki of the project.

### Describe the solution you'd like

Create a "Documentation" section with:
- link to the wiki for further information regarding the community
- link to open sessions which include the meeting minutes,
- link to the video of GSoC: https://youtu.be/3A746GppZ0Y
- link of adding a video of setting up the project: https://youtu.be/_b2RQGbYN9w
- link of the question in zulip chats.

You can check these resources on this [zulip message](https://anitab-org.zulipchat.com/#narrow/stream/237907-open-source-progs/topic/Open.20Sessions/near/225236028)