add mkdocs

docs/widgets/services/whatsupdocker.md

@@ -0,0 +1,14 @@
+---
+title: Whats Up Docker
+description: WhatsUpDocker Widget Configuration
+---
+
+Currently requires unauthenticated whatsupdocker instance.
+
+Allowed fields: `["monitoring", "updates"]`.
+
+```yaml
+widget:
+    type: whatsupdocker
+    url: http://whatsupdocker:port
+```