Added doc/: readme, license, roadmap.

doc/README

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+statgit is a statistics generator for revision control systems (for now, only
+git). It is mostly intended for developers, as a way to check some development
+statistics for a project.
+

doc/license

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+License is GPLv2.

doc/roadmap.txt

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+[0.0.1]
+- Some basic data in tables/lists
+