add status indicator doc

_docs/connectors.md

@@ -1,4 +1,4 @@
-# connectors
+# Connectors
 
 `ctop` comes with the below native connectors, enabled via the `--connector` option.
 

_docs/status.md

@@ -0,0 +1,18 @@
+# Status Indicator
+
+The `ctop` grid view provides a compact status indicator to convey container state
+<p align="center"><img width="200px" src="img/status.png" alt="ctop"/></p>
+
+Appearance | Description
+--- | ---
+red | container is stopped
+green | container is running
+two vertical bars (▮▮) | container is paused
+
+If the container is configured with a health check, a `+` will appear next to the indicator
+
+Appearance | Description
+--- | ---
+red | health check in failed state
+yellow | health check in starting state
+green | health check in OK state