Adding a new module to CVS
drupal.org/handbook/cvs/quickstart
First, check out the modules directory from the HEAD version of the contributions repository:
cvs checkout -l contributions/modules
The -l parameter (for "local") tells CVS to only check out the given directory, not all of the directories underneath it.
Next, copy your module files into the contributions/modules directory.
cd contributions/modules
cp -r ~/drupal/modules/example example
Finally, add your files to CVS.
cvs add example
cvs add example/*
cvs commit -m "Initial commit of example module. Here is a brief description of what this module does."