additions from backlog and osgameclones

entries/xargon.md

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+# Xargon
+
+- Home: https://github.com/Malvineous/xargon
+- Inspiration: Xargon
+- State: mature, inactive since 2015
+- Keyword: remake, content original required (freeware)
+- Code repository: https://github.com/Malvineous/xargon.git
+- Code language: C++
+- Code license: GPL-3.0
+- Code dependency: SDL
+- Developer: Adam Nielsen
+
+## Building
+
+- Build system: Make