New file.

doc/server-config.extend

+-*- text -*-
+
+How to add more configuration to the server
+-------------------------------------------
+
+1. Think twice about what it really is you want to configure.  Find a
+   good, descriptive name for it.
+
+2. Think twice about which values the parameter can be set to.
+   Integers?  Booleans?
+
+3. Document it in src/doc/man/lyskomd.8.
+
+4. Add a field to in in struct kom_par (in src/server/param.h).
+
+5. Add it to parameters[] in src/server/server-config.c.  See
+   src/server/conf-file.h (and maybe src/server/conf-file.c).
+
+6. Make sure the parameter is used instead of any previous hard-coded
+   value.  Make sure that dbck can cope with it.
+
+That's all there is to it!