create mockup (issue #83)
This version introduces multiple enhancements:

Mockup project files and preview

Details of additions/deletions below:
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Added:      /docs/commit-creator-mockup/commit generator.screen
            -- Added --
               project file

Added:      /docs/commit-creator-mockup/commit generator.proj
            -- Added --
               project file

Added:      /docs/commit-creator-mockup/commit generator - Start.png
            -- Added --
               mockup preview