Added some docs about status checks

docs/status-indicators.md

@@ -0,0 +1,46 @@
+# Status Indicators
+
+Dashy has an optional feature that can display a small icon next to each of your running services, indicating it's current status. This is useful if you are using Dashy as your homelab's start page, as it gives you an overview of the health of each of your running services.
+
+<p align="center">
+  <img width="800" src="/docs/assets/status-check-demo.gif" />
+</p>
+
+## Enabling Status Indicators
+By default, this feature is off. If you do not want this feature, just don't add the `statusCheck` to your conf.yml file, then no requests will be made.  
+
+To enable status checks, you can either turn it on for all items, by setting `appConfig.statusCheck: true`, like:
+```yaml
+appConfig:
+  statusCheck: true
+```
+
+Or you can enable/ disable it on a per-item basis, with the `item[n].statusCheck` attribute
+```yaml
+sections:
+- name: Firewall
+  items:
+  - title: OPNsense
+    description: Firewall Central Management
+    icon: networking/opnsense.png
+    url: https://192.168.1.1
+		statusCheck: false
+  - title: MalTrail
+    description: Malicious traffic detection system
+    icon: networking/maltrail.png
+    url: http://192.168.1.1:8338
+		statusCheck: true
+  - title: Ntopng
+    description: Network traffic probe and network use monitor
+    icon: networking/ntop.png
+    url: http://192.168.1.1:3001
+		statusCheck: true
+```
+
+## How it Works
+
+When Dashy is loaded, items with `statusCheck` enabled will make a request, to `https://[your-host-name]/ping?url=[address-or-servce]`, which in turn will ping that running service, and respond with a status code. Response time is calculated from the difference between start and end time of the request. 
+
+An indicator will display next to each item, and will be yellow while waiting for the response to return, green if request was successful, red if it failed, and grey if it was unable to make the request all together.
+
+All requests are made straight from your server, there is no intermediary. So providing you are hosting Dashy yourself, and are checking the status of other self-hosted services, there shouldn't be any privacy concerns.