RFR: 6835: Adding developer guide for getting started with development

[Guru Hb]

On Wed, 10 Jun 2020 20:08:38 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

> This PR adds a short developer guide, to help newcomers getting started setting up the development environment.

Would it be helpful to have image with prefix ? (looks better for user to go by order).

docs/devguide/README.md line 15:

> 14:
> 15: ![Workspace Selection](images/workspace.png)
> 16:

[nit] Pre-fixing image name like 01-workspace.png , 02-setinstalledjre.png... 10-formattersettings.png . would help a
bit if the user wants to view these settings in order in there Folder (Explorer / Finder).

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PR: https://git.openjdk.java.net/jmc/pull/82