Created Service Discovery (markdown)

Service-Discovery.md

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+## Overview
+
+Homepage features automatic service discovery for containers with the proper labels attached, all configuration options can be applied using dot notation, begging with `homepage`.
+
+Below is an example of the same service entry shown above, as docker labels.
+
+```yaml
+services:
+  emby:
+    image: lscr.io/linuxserver/emby:latest
+    container_name: emby
+    ports:
+      - 8096:8096
+    restart: unless-stopped
+    labels:
+      - homepage.group=Media
+      - homepage.name=Emby
+      - homepage.icon=emby.png
+      - homepage.href=http://emby.home/
+      - homepage.description=Media server
+```
+
+When your Docker instance has been properly configured, this service will be automatically discovered and added to your Homepage.  **You do not need to specify the `server` or `container` values, as they will be automatically inferred.**
+
+## Widets
+
+You may also configure widgets, along with the standard service entry, again, using dot notation.
+
+
+```yaml
+labels:
+  - homepage.group=Media
+  - homepage.name=Emby
+  - homepage.icon=emby.png
+  - homepage.href=http://emby.home/
+  - homepage.description=Media server
+  - homepage.widget.type=emby
+  - homepage.widget.url=http://emby.home
+  - homepage.widget.key=yourembyapikeyhere
+```
+
+## Caveats
+
+Currently, there is no way to define rigid ordering when using service discovery, and the order will be determined by the order returned from the Docker API.  Discovered services take precedence over services defined in `services.yaml` and will show above them.