additions from backlog, issues, osgameclones

entries/gbdk.md

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+# GBDK
+
+- Home: https://gbdk-2020.github.io/gbdk-2020/, http://gbdk.sourceforge.net/, https://sourceforge.net/projects/gbdk/
+- State: mature
+- Download: https://github.com/gbdk-2020/gbdk-2020/releases
+- Platform: Windows, Linux, macOS
+- Keyword: library, tool
+- Code repository: https://github.com/gbdk-2020/gbdk-2020.git
+- Code language: C, Assembly, C++
+- Code license: MIT
+
+Short for "Gameboy Development Kit"
+
+## Building
+
+- Build system: Make