added manage.py for CLI tool

manage.py

@@ -0,0 +1,82 @@
+import argparse
+import os
+import subprocess
+from multiprocessing import Process
+import sys
+
+BASE_DIR = os.path.dirname(__file__)
+
+APP_DESC = """
+Crawlab CLI tool. 
+
+usage: python manage.py [action]
+
+action:
+    serve: start all necessary services to run crawlab. This is for quick start, please checkout Deployment guide for production environment.
+    app: start app + flower services, normally run on master node.
+    worker: start app + worker services, normally run on worker nodes.
+    flower: start flower service only.
+    frontend: start frontend/client service only.
+"""
+ACTION_LIST = [
+    'serve',
+    'app',
+    'worker',
+    'flower',
+    'frontend',
+]
+if len(sys.argv) == 1:
+    print(APP_DESC)
+    sys.argv.append('--help')
+parser = argparse.ArgumentParser()
+parser.add_argument('action', type=str)
+args = parser.parse_args()
+
+
+def run_app():
+    p = subprocess.Popen([sys.executable, os.path.join(BASE_DIR, 'crawlab', 'app.py')])
+    p.communicate()
+
+
+def run_flower():
+    p = subprocess.Popen([sys.executable, os.path.join(BASE_DIR, 'crawlab', 'flower.py')])
+    p.communicate()
+
+
+def run_worker():
+    p = subprocess.Popen([sys.executable, os.path.join(BASE_DIR, 'crawlab', 'worker.py')])
+    p.communicate()
+
+
+def run_frontend():
+    p = subprocess.Popen(['npm', 'run', 'serve'],
+                         cwd=os.path.abspath(os.path.join(BASE_DIR, 'frontend')))
+    p.communicate()
+
+
+def main():
+    p_app = Process(target=run_app)
+    p_flower = Process(target=run_flower)
+    p_worker = Process(target=run_worker)
+    p_frontend = Process(target=run_frontend)
+    if args.action == 'serve':
+        p_app.start()
+        p_flower.start()
+        p_worker.start()
+        p_frontend.start()
+    elif args.action == 'app':
+        p_app.start()
+        p_flower.start()
+    elif args.action == 'worker':
+        p_app.start()
+        p_worker.start()
+    elif args.action == 'flower':
+        p_flower.start()
+    elif args.action == 'frontend':
+        p_frontend.start()
+    else:
+        print(f'Invalid action: {args.action}')
+
+
+if __name__ == '__main__':
+    main()