Added Enum documentation

Author: syrusakbary

docs/config.toml

@@ -14,6 +14,7 @@ ga = "UA-12613282-7"
 	  "/docs/objecttypes/",
 	  "/docs/mutations/",
 	  "/docs/basic-types/",
+	  "/docs/enums/",
 	  "/docs/relay/",
 	]
 

docs/pages/docs/enums.md

@@ -0,0 +1,33 @@
+---
+title: Enums
+description: Walkthrough Enums
+---
+
+# Enums
+
+A `Enum` is a special `GraphQL` type that represents a set of symbolic names (members) bound to unique, constant values.
+
+## Enum definition
+
+You can create an `Enum` using classes:
+
+```python
+import graphene
+
+class Episode(graphene.Enum):
+    NEWHOPE = 4
+    EMPIRE = 5
+    JEDI = 6
+```
+
+But also using instances of Enum:
+
+```python
+Episode = graphene.Enum('Episode', [('NEWHOPE', 4), ('EMPIRE', 5), ('JEDI', 6)])
+```
+
+## Notes
+
+Internally, `graphene.Enum` uses [`enum.Enum`](https://docs.python.org/3/library/enum.html) Python implementation if available, or a backport if not.
+
+So you can use it in the same way as you would do with Python `enum.Enum`.