imports from libregamewiki, conversions cvs to git, correcting keywords and code dependencies

entries/slingshot.md

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+# Slingshot
+
+_Gravity‐based turn based strategy game._
+
+- Home: https://web.archive.org/web/20150630125714/http://slingshot.wikispot.org/, https://sourceforge.net/projects/slingshot-game/
+- State: beta, inactive since 2007
+- Download: https://web.archive.org/web/20150630152307/http://slingshot.wikispot.org/Downloads, https://sourceforge.net/projects/slingshot-game/files/
+- Platform: Windows, Linux, macOS
+- Keywords: strategy, open content, turn-based
+- Code repository: https://svn.code.sf.net/p/slingshot-game/code/trunk (svn)
+- Code language: Python
+- Code license: GPL-2.0
+- Code dependencies: pygame
+- Assets license: GPL-2.0
+
+Developer: Jonathan Musther, Bart Mak
+
+## Building