update help message

cpm/CpmLogic.icl

@@ -174,6 +174,7 @@ doProjectAction _          _  _   _    world             =
     ,  "  build [--force] [--envs=filename] : build the project. Optionally force build (default: 'false')"
     ,  "                                      Optionally specify the environments file (default: 'IDEEnvs')"
     ,  "  path                              : manage project paths"
+    ,  "  root                              : set the project root"
     ,  "  target <env>                      : set target environment to <env>"
     ,  "  exec <execname>                   : set executable name to <execname>"
     ,  "  set option [option]               : Set one or more of the following options:"