Add GDK docs for working with GoProxy
What does this Merge Request do?
Adds how-to docs for setting up a local development environment to run the GoProxy package feature. A general doc is created to contain any how-to instructions for package managers.
Merge Request checklist
- [-] Tests added for new functionality. If not, please raise Issue to follow-up.
- [-] This change is backward compatible. If not, please include steps to communicate to our users.
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Documentation added/updated, if needed. - [-]
gdk doctor
test added, if needed.