Feature: Plant-it widget (#2941)

docs/widgets/services/planit.md

@@ -0,0 +1,15 @@
+---
+title: Plant-it
+description: Plant-it Widget Configuration
+---
+
+Learn more about [Plantit](https://github.com/MDeLuise/plant-it).
+
+API key can be created from the REST API.
+
+```yaml
+widget:
+  type: plantit
+  url: http://plant-it.host.or.ip:port # api port
+  key: plantit-api-key
+```