fixed entries (mostly naming of licenses) and added entry

games/strategy/free_mars.md

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+# Free Mars
+
+_Turn based free strategy game about colonizing Mars._
+
+- Home: https://sourceforge.net/projects/freemars
+- State: mature
+- Download: https://sourceforge.net/projects/freemars/files
+- Platform: Windows, Linux, MacOs
+- Keywords: TB
+- Code repository: https://svn.code.sf.net/p/freemars/code/ (svn)
+- Code language: Java
+- Code license: GPL-3.0
+
+
+## Building
+
+- Build system: Ant