Rename main.py to codegen.py

Update the `generate` command to print "Generation process started"

Add a new `verify` command that prints "Verification complete"

codegen.py

@@ -2,7 +2,12 @@
 
 @click.command()
 def generate():
-    click.echo("Starting the generation process...")
+    click.echo("Generation process started")
+
+@click.command()
+def verify():
+    click.echo("Verification complete")
 
 if __name__ == "__main__":
     generate()
+    verify()