add cli flag -v to show version info

manimlib/__init__.py

@@ -1,3 +1,7 @@
+import pkg_resources
+
+__version__ = pkg_resources.get_distribution("manimgl").version
+
 from manimlib.constants import *
 
 from manimlib.animation.animation import *

manimlib/__main__.py

@@ -7,6 +7,12 @@ import manimlib.utils.init_config
 def main():
     args = manimlib.config.parse_cli()
 
+    if args.version:
+        from manimlib import __version__
+        print(f"ManimGL v{__version__}")
+        if args.file == None:
+            return
+
     if args.config:
         manimlib.utils.init_config.init_customization()
     else:

manimlib/config.py

@@ -136,6 +136,11 @@ def parse_cli():
             "--config_file",
             help="Path to the custom configuration file",
         )
+        parser.add_argument(
+            "-v", "--version",
+            action="store_true",
+            help="Display the version of manimgl"
+        )
         args = parser.parse_args()
         return args
     except argparse.ArgumentError as err: