Add an example GAP server

lib/example_server.g

+LoadPackage("scscp");
+
+InstallSCSCPprocedure( "DihedralGroup", DihedralGroup, 1, 1);
+
+InstallSCSCPprocedure( "DihedralGroupAsPermGroup", n -> DihedralGroup(IsPermGroup,n), 1, 1);
+
+RunSCSCPserver( "localhost", 26133 );
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