Create identity.md

Tag to demonstrate the difference between `is` and `==`.

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+**Identity vs. Equality**
+
+Should I be using `is` or `==`?
+
+To check if two things are equal, use the equality operator (`==`).
+```py
+x = 5
+if x == 5:
+    print("x equals 5")
+if x == 3:
+    print("x equals 3")
+# Prints 'x equals 5'
+```
+
+To check if two things are actually the same thing in memory, use the identity comparison operator (`is`).
+```py
+x = [1, 2, 3]
+y = [1, 2, 3]
+if x is [1, 2, 3]:
+    print("x is y")
+z = x
+if x is z:
+    print("x is z")
+# Prints 'x is z'
+```