Javadoc jar so implementers can click and read docs

[techygrrrl]

Clicking shows that the source is de-compiled class file / bytecode.

An error is also present if you click "Download sources" since the sources jar doesn't exist:

Execution failed for task ':ijDownloadSourcesf2784008-3e5'.
> Could not resolve all files for configuration ':downloadSources_8840e521-8157-492d-8b5e-bac20319b9d7'.
   > Could not find Magic8Ballrrr-0.1.1-sources.jar (com.github.techygrrrl:Magic8Ballrrr:0.1.1).
     Searched in the following locations:
         https://jitpack.io/com/github/techygrrrl/Magic8Ballrrr/0.1.1/Magic8Ballrrr-0.1.1-sources.jar