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

entries/solarus.md

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+# Solarus
+
+_Zelda-like 2D game engine for Action-RPGs._
+
+- Home: http://www.solarus-games.org/ 
+- State: mature
+- Download: https://www.solarus-games.org/en/solarus/download
+- Keywords: framework, game-engine, inspired by Zelda - A Link to the Past, remake
+- Code repository: https://gitlab.com/solarus-games/solarus.git, https://github.com/solarus-games/solarus.git (archived)
+- Code language: C, C++, Lua
+- Code license: GPL-3.0
+- Assets license: CC-BY-SA
+
+## Building
+
+- Build system: CMake