Provide new openETCS Release and Deployment Plan

[BerndHekele]

The plan is needed as an extension of the QA plan.

[BerndHekele]

Document available for revision
@janWelte, @UweSteinkeFromSiemens, @idelatorre , @MarcBehrens

Your feedback is highly appreciated.

br
Bernd

[janWelte]

I'll give my feedback next week.

[BerndHekele]

You can find the related document here:
https://github.com/openETCS/governance/tree/master/SoftwareReleaseAndDeploymentPlan

(updated after move)