Add initial API Integration document

docs/api-integration.md

@@ -0,0 +1,19 @@
+# API Integration
+
+NetBox features a read-only REST API which can be used to integrate it with
+other applications.
+
+In the future, both read and write actions will be available via the API.
+
+## Clients
+
+The easiest way to start integrating your applications with NetBox is to make
+use of an API client.  If you build or discover an API client that is not part
+of this list, please send a pull request!
+
+- **Go**: [github.com/digitalocean/go-netbox](https://github.com/digitalocean/go-netbox)
+
+## Documentation
+
+If you wish to build a new API client or simply explore the NetBox API,
+Swagger documentation can be found at the URL `/api/docs/` on a NetBox server.