Added README.md and command line interface.

omg.py

@@ -1,6 +1,7 @@
 #!/usr/bin/python3
 
 import os
+import sys
 import yaml
 import json
 import collections.abc
@@ -232,6 +233,13 @@ def recursive_update(a: collections.abc.Mapping, b: collections.abc.Mapping) ->
 
 
 if __name__ == "__main__":
-    bla = OMG("/home/emil/Dokumente/Obsidian/Gulm")
+    if len(sys.argv) > 1:
+        vault_path = sys.argv[1]
+        metadata_path = None
+
+        if len(sys.argv) > 2:
+            metadata_path = sys.argv[2]
+
+        metadata = OMG(vault_path)
+        metadata.dump(metadata_path)
 
-    print(json.dumps(bla.md_files, indent=2))