Add badges to README

[jankapunkt]

We need the following badges:

• the following actions workflow badges:
  • https://github.com/node-oauth/node-oauth2-server/actions/workflows/tests.yml
  • https://github.com/node-oauth/node-oauth2-server/actions/workflows/codeql-analysis.yml
  • https://github.com/node-oauth/node-oauth2-server/actions/workflows/tests-release.yml
• repostatus.org "active" badge (indicating this is an active repo)
• shields.io version
• shields.io npm downloads/week
• shields.io license badge

The badges should be placed like so:

Complete, compliant and well tested module for implementing an OAuth2 server in Node.js.

Badges here

NOTE: This project has been forked from...

Please use the "markdown" versions of the badges, not html or others.

[jmakhack]

Hey, I'd love to work on this issue. Can it be assigned to me if it is still available?

[jankapunkt]

@jmakhack go for it

[jankapunkt]

@jmakhack please don't forget to read our contribution guide, especially on commit and pull request conventions. Thank you :-)