Improve marketplace listing

[timja]

Describe your use-case which is not covered by existing documentation.

Listing: https://plugins.jetbrains.com/plugin/1885-jenkins-development-support/

• Features on the marketplace, too high level right now
• Add screenshots
  • Maybe gif?
• Improve getting started section

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Plugin description is taken from the README.
Most of the rest of it is uploaded directly in the marketplace UI.

All text formatting is done with HTML

Pictures can't have alt+text or captions so any text must be manually overlayed.

Reference any relevant documentation, other materials or issues/pull requests that can be used for inspiration.

https://plugins.jetbrains.com/docs/marketplace/best-practices-for-listing.html#plugin-description

Look at other listings for inspiration: https://plugins.jetbrains.com/

Are you interested in contributing to the documentation?

No response

[timja]

I've uploaded some images.

I've used 48pt Arial added with https://jspaint.app/

[timja]

I've added an initial getting started section

[timja]

cc @janfaracik in case you have any ideas

[timja]

I added the community forum link: https://community.jenkins.io/