additions from osgameclones, maintenance on keywords, backlog reduced partly moved to GH issues

entries/columns.md

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+# Columns
+
+- Home: https://github.com/dgcor/Columns
+- Inspiration: Columns
+- State: mature
+- Keyword: arcade, clone, commercial content, tetris-like
+- Code repository: https://github.com/dgcor/Columns.git
+- Code language: C++
+- Code license: zlib (many different ones)
+- Code dependency: SFML, DGEngine
+
+## Building
+
+- Build system: CMake