feat: add version option and description to main command

Author: dwr-psandhu

pydelmod/cli.py

@@ -7,6 +7,7 @@
 from pydelmod import dsm2_chan_mann_disp
 from pydelmod import create_ann_inputs
 from pydelmod import datastore2dss
+from pydelmod._version import __version__
 import sys
 import click
 import panel as pn
@@ -18,7 +19,9 @@
 
 
 @click.group(context_settings=CONTEXT_SETTINGS)
+@click.version_option(__version__, "-v", "--version", message="%(prog)s, version %(version)s")
 def main():
+    """PyDelMod - Python Delta Modeling Tools."""
     pass