Add AttributeDefinition class

This class will be used in decision trees.

src/AI/DecisionTrees/AttributeDefinition.py

@@ -0,0 +1,14 @@
+from typing import List
+
+
+class AttributeDefinition:
+    def __init__(self, id, name: str, values: List):
+        """
+
+        :param id:
+        :param name: Attribute name
+        :param values: Possible values
+        """
+        self.id = id
+        self.name = name
+        self.values = values