Equality docs

docs/docs_equality.rst

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+.. include:: ./vars.rst
+
+Equality
+========
+
+The Equality class is used to see if two objects are equal, based on ``object_1.id === object_2.id``.
+
+If any class in Discord extends equality, it means you should never the default equality operands (``==`` & ``===``) as they could potentially be different instances and therefore appear not to be equal. Instead, use ``equalityObject.equals()`` as shown below.
+
+Functions
+---------
+
+--------
+
+equals(object)
+~~~~~~~~~~~~~~
+
+Returns true if the specified object is the same as this one.
+
+- **object** - Any `object` with an ``id`` property.