[MPH-122] add help:color-style goal to describe styles color

**[Hervé Boutemy](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=hboutemy)** opened **[MPH-122](https://issues.apache.org/jira/browse/MPH-122?redirect=false)** and commented

as discussed on users@maven ML: https://lists.apache.org/thread.html/09fa512d289a02c3c7d5262cbeff3285fe36e7eaa935528de69191ac@%3Cusers.maven.apache.org%3E

> I vote for a help plugin goal, like help:color-style. It could show a brief summary and how to customize, list available settings, and print active settings.

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**Affects:** 2.2

**Issue Links:**
- [MSHARED-687](https://issues.apache.org/jira/browse/MSHARED-687) Programmatic read-only access to Color API
(_**"requires"**_)

0 votes, 5 watchers

Start with the users@maven discussion linked in MPH-122 and the required MSHARED-687 issue for read-only Color API access. Define the help:color-style goal around a summary, customization guidance, available settings, and active settings; done means those details are exposed through the Maven Help Plugin.

Written by the indexing model from the issue text.