Created graphql (markdown)

graphql.md

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+Statping implements the [GraphQL](https://graphql.org/) API interface so you can customize the exact data you need within a query. The GraphQL endpoint is at `/graphql` on your Statping instance and is only available for Authenticated users or while sending the `Authorization` API Secret. 
+
+<p align="center">
+<a href="https://github.com/hunterlong/statping/blob/master/handlers/graphql/schema.graphql">View schema.graphql</a>
+</p>
+
+***
+
+### Example Queries
+
+Retrieve the `id`, `name`, and `public` parameters from `service` #2.
+###### GraphQL Query:
+```graphql
+{
+  service(id: 2) {
+    id
+    name
+    public
+  }
+}
+```
+###### Response:
+```json
+{
+  "data": {
+    "service": {
+      "id": 2,
+      "name": "Statping Github",
+      "public": true
+    }
+  }
+}
+```
+
+***