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

entries/endless_sky.md

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+# Endless Sky
+
+_2D space trading and combat game similar to the classic Escape Velocity series._
+
+- Home: https://endless-sky.github.io/
+- Media: https://en.wikipedia.org/wiki/Escape_Velocity_(video_game)#Legacy
+- State: mature
+- Download: https://github.com/endless-sky/endless-sky/releases
+- Keywords: role playing, clone, inspired by Escape Velocity, popular
+- Code repository: https://github.com/endless-sky/endless-sky.git
+- Code language: C++
+- Code license: GPL-3.0
+- Assets license: CC-BY-SA
+
+## Building
+