Update README.md

Author: dubbelj

README.md

@@ -1,2 +1,15 @@
 # librenms-plugin-xDP
 A LibreNMS plugin that show what cdp/lldp neibours that is connected to a device and can export to Weathermap configuration
+
+# Requirements
+This plugin is dependent of GraphWiz https://www.graphviz.org/ tool "dot" to generate the pictures.
+dot need to be in the $PATH.
+
+# INSTALL
+Copy the xDP directory to your librenms/html/plugins/ directory. In Librenms go to Overview->Plugins->Plugin Admin Click enable on "xDP"
+
+# USAGE
+Go to Overview->Plugins->xDP
+1. Select one of your devices
+2. Press one of the buttons to generate list of neibours, graph or Weathermap data.
+3. Optional is to for example add additional port_ids to include in the graph or enter regexps to exclude neibour name/type. For example I like to exclude all IP-phone and they all start with SEP enter ^SEP in "Exclude unmanaged neibours where device name match"