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

entries/doukutsu-rs.md

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+# doukutsu-rs
+
+- Home: https://github.com/doukutsu-rs/doukutsu-rs
+- Inspiration: Cave Story
+- State: beta
+- Keyword: remake, content commercial + original required
+- Code repository: https://github.com/doukutsu-rs/doukutsu-rs.git
+- Code language: Rust
+- Code license: MIT
+
+## Building