more entries and slightly different style of autogenerated content

library/pkgconfig.md

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+# pkg-config
+
+_Tool used when compiling applications and libraries._
+
+- Home: https://www.freedesktop.org/wiki/Software/pkg-config/
+- Wikipedia: https://en.wikipedia.org/wiki/Pkg-config
+- Download: https://pkg-config.freedesktop.org/releases/
+- State: mature
+- Keywords: tool
+- Code: git://anongit.freedesktop.org/pkg-config
+- Language(s): C
+- License: GPL-2.0
+
+## Building