added some code dependencies and maintenance

entries/pgu.md

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+# PGU
+
+_Collection of useful modules for writing games with PyGame._
+
+- Home: https://github.com/parogers/pgu, https://code.google.com/archive/p/pgu/
+- State: mature
+- Download: https://pypi.org/project/pygame-pgu/
+- Platform: Windows, Linux, macOS
+- Keywords: library
+- Code repository: https://github.com/parogers/pgu.git
+- Code language: Python
+- Code license: LGPL-2.1
+- Developer: Phil Hassey (http://www.philhassey.com/blog/), Peter Rogers (parogers@GH)
+
+## Building
+
+- Build system: setup.py
+