adding initial CLI support

src/crewai/cli/cli.py

@@ -0,0 +1,19 @@
+import click
+
+from .create_crew import create_crew
+
+
+@click.group()
+def crewai():
+    """Top-level command group for crewai."""
+
+
+@crewai.command()
+@click.argument("project_name")
+def create(project_name):
+    """Create a new crew."""
+    create_crew(project_name)
+
+
+if __name__ == "__main__":
+    crewai()