renamed games folder to entries folder (also contained frameworks, libraries, ...) and added to the backlog

entries/spring.md

@@ -0,0 +1,20 @@
+# Spring
+
+_Game engine for real-time strategy (RTS) video games._
+
+- Home: https://springrts.com/, https://springrts.com/wiki/Main_Page, https://sourceforge.net/projects/springrts/
+- Media: https://en.wikipedia.org/wiki/Spring_Engine
+- State: mature
+- Download: https://springrts.com/wiki/Download
+- Keywords: strategy, game engine, inspired by Total Annihilation, real time, remake
+- Code repository: https://github.com/spring/spring.git, https://git.code.sf.net/p/springrts/code
+- Code language: C++, C, Lua
+- Code license: GPL-2.0
+
+See also [Spring 1944](http://spring1944.net/) a special scenario of the spring engine, code: https://github.com/spring1944/spring1944
+
+Or [ZeroK](http://zero-k.info/) another game using SpringRTS.
+
+## Building
+
+- Build system: CMake