additions from libregamewiki and backlog

entries/oreon_engine.md

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+# Oreon Engine
+
+- Home: https://github.com/fynnfluegge/oreon-engine
+- State: mature
+- Download: https://github.com/fynnfluegge/oreon-engine/releases
+- Platform: Windows, Linux, macOS
+- Keyword: game engine
+- Code repository: https://github.com/fynnfluegge/oreon-engine.git
+- Code language: Java
+- Code license: GPL-3.0
+
+## Building
+
+- Build system: Maven