doc: define runtime library

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diff --git a/doc/src/03100-lib-rt.md b/doc/src/03100-lib-rt.md
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+# librt {#sec:librt}
+
+The runtime library provides types and functions which MUST be used by the
+modules to implement the commandline interface, configuration file parsing and
+logging.
+
+The runtime library provides basic functionality for configuration file parsing
+and logging setup.
+The runtime library also provides helper functions for building a commandline
+interface.
+