code and documentation tidied up

front/plugins/undiscoverables/README.md

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+## Overview
+
+A plugin allowing for importing Un-Discoverable devices from the settings page.
+
+
+### Usage
+
+- Go to settings and find Un-Discoverabe Devices in the list of plugins.
+- Enable the plugin by changing the RUN parameter from disabled to `once` or `always_after_scan`.
+- Add the name of your device to the list. (remove the sample entry first)
+- SAVE
+- wait for the next scan to finish
+
+#### Example: 
+
+
+
+### Known Limitations
+ - Un-Discoverable Devices always show as offline. That is expected as they can not be discovered by Pi.Alert.
+ - All IPs are set to 0.0.0.0 therefore the "Random MAC" icon might show up.