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

entries/tennix.md

@@ -0,0 +1,15 @@
+# Tennix!
+
+_Tennis game._
+
+- Home: http://icculus.org/tennix/, http://icculus.org/tennix/pre2009/
+- State: mature
+- Keywords: strategy, sport
+- Code repository: http://repo.or.cz/tennix.git
+- Code language: C, C++
+- Code license: GPL-2.0
+- Code dependencies: SDL
+
+Developer: Thomas Perl
+
+## Building