added some code dependencies and maintenance

entries/libvorbis.md

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+# libvorbis
+
+_Vorbis audio compression reference implementation._
+
+- Home: https://xiph.org/vorbis/
+- Media: https://en.wikipedia.org/wiki/Vorbis
+- State: mature
+- Download: https://xiph.org/downloads/
+- Platform: Linux
+- Keywords: library
+- Code repository: https://git.xiph.org/vorbis.git
+- Code language: C
+- Code license: 3-clause BSD
+
+## Building
+
+- Build system: CMake