Add simple dev server entrypoint

imagemonk/__main__.py

@@ -0,0 +1,43 @@
+"""Development server stub entrypoint
+
+Flask comes with a built-in development server. This entrypoint allows ``imagemonk``
+to be run directly to run the development server and expose some simple config options for ease of
+access. Run the below command to start the server:
+
+::
+
+  python -m imagemonk
+
+In addition to the helpful CLI flags, the Flask development server run by this module will also
+load any ``.env`` files in the current working directory when running the application.
+
+.. warning:: As the development server will tell you on startup, do not use this for production
+             deployments.
+"""
+import argparse
+import sys
+
+from imagemonk.application import APPLICATION
+
+
+# pylint: disable=invalid-name
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "-b",
+        "--bind",
+        help="Address or socket to bind the server to",
+        default="127.0.0.1",
+    )
+    parser.add_argument(
+        "-p", "--port", help="Port bind the server to", default=5000, type=int
+    )
+    parser.add_argument(
+        "-D", "--debug", help="Run Flask in debug mode", action="store_true"
+    )
+    args = parser.parse_args()
+    APPLICATION.run(host=args.bind, port=args.port, debug=args.debug, load_dotenv=True)
+
+
+if __name__ == "__main__":
+    sys.exit(main())