Add SiteSage Emonitor integration (#17129)

source/_integrations/emonitor.markdown

@@ -0,0 +1,19 @@
+---
+title: "SiteSage Emonitor"
+description: "Instructions on how to integrate a SiteSage Emonitor within Home Assistant."
+ha_release: "2021.5"
+ha_category:
+    - Sensor
+ha_iot_class: "Local Polling"
+ha_config_flow: true
+ha_dhcp: true
+ha_codeowners:
+  - '@bdraco'
+ha_domain: emonitor
+ha_platforms:
+    - sensor
+---
+
+The SiteSage Emonitor allows local power monitoring on a per circuit basis via an [Emonitor](https://powerhousedynamics.com/solutions/sitesage/) device.
+
+{% include integrations/config_flow.md %}