adds command line interface

vk_url_scraper/utils.py

@@ -0,0 +1,16 @@
+import json
+import os
+from datetime import datetime
+
+
+class DateTimeEncoder(json.JSONEncoder):
+    # to allow json.dump with datetimes do json.dumps(obj, cls=DateTimeEncoder)
+    def default(self, o):
+        if isinstance(o, datetime):
+            return str(o)  # with timezone
+        return json.JSONEncoder.default(self, o)
+
+
+def mkdir_if_not_exists(folder):
+    if not os.path.exists(folder):
+        os.makedirs(folder)