Add claat main command doc comment
Add claat main command doc comment

chrisrecher/tools,Qwiklabs/codelab-tools,CloudVLab/tools,chrisrecher/tools,googlecodelabs/tools,googlecodelabs/tools,googlecodelabs/tools,Qwiklabs/codelab-tools,CloudVLab/tools,googlecodelabs/tools,Qwiklabs/codelab-tools,Qwiklabs/codelab-tools