Document plugins

[zugaldia]

Once we're able to publish the plugins to Maven #3 and once we have the first plugin ready #4 (both are happening shortly) we'll want to make this repository available for anyone to use. For this to happen we have to document:

• the list of available plugins with descriptions
• information on how to install them via Maven/Gradle
• examples on how to use them (reference implementation is in the test app)
• information on how to contribute a plugin

Initially, we can use the README file in this repo but, ideally, we'll integrate this documentation with the rest of the Android docs (new Plugins tab in https://www.mapbox.com/android-docs?).

@langsmith Could you add to OP anything I might have missed and run point on this?

@ericrwolfe Do we have a similar ticket for iOS? Do we have any comms plans in the pipeline?

cc: @cammace @tobrun

[langsmith]

Will do @zugaldia

[langsmith]

cc @danswick

[langsmith]

Initial draft of Plugin docs layout. Lots more to come...

[zugaldia]

@langsmith Anything that we should bring to this repo's README. I think having this file in good shape is the absolute minimum we should have ready before the release.

[langsmith]

@zugaldia , I've cleaned up and re-ordered the readme so that the repo's at least fit for a release. Here's the PR for the readme update

[zugaldia]

@langsmith thank you! I'll give it a pass and merge it.

[tobrun]

this has been merged 🎉, closing