feat: add mmr for User class

Author: NumberPigeon

sc2reader/objects.py

@@ -285,6 +285,21 @@ def __init__(self, uid, init_data):
         #: This is deprecated because it doesn't actually work.
         self.recorder = None
 
+        #: The user's mmr at the time of the game
+        #: Currently, there are three cases observed for a user that does not have a current mmr:
+        #: 1. The user has no 'scaled_rating' key in their init_data,
+        #: 2. The user has a None value for their 'scaled_rating' key, or
+        #: 3. The user has a negative rating, often -36400.
+        #: For ease of use, this property will return None in both cases.
+        if (
+            "scaled_rating" in init_data
+            and init_data["scaled_rating"] is not None
+            and init_data["scaled_rating"] > 0
+        ):
+            self.mmr = init_data["scaled_rating"]
+        else:
+            self.mmr = None
+
     @property
     def url(self):
         """