Add Applications docs

doc/Extensions/Applications.md

@@ -0,0 +1,19 @@
+Application Monitoring
+----------------------
+
+LibreNMS supports monitoring application statistics through two methods the [Agent](http://docs.librenms.org/Extensions/Agent-Setup/) or direct connection to the device.
+
+To enable the agent go to device settings -> applications and enable the "unix-agent"
+If you are using direct connection to collect statistics, you must manually enable the desired apps in the device settings -> applications page.
+
+##Applications
+
+###PowerDNS Recursor
+A recursive DNS sever: https://www.powerdns.com/recursor.html
+#### Connection
+The LibreNMS polling host must be able to connect to port 8082 on the monitored device.
+The web-server must be enabled, see the Recursor docs: https://doc.powerdns.com/md/recursor/settings/#webserver
+There is currently no way to specify a custom port or password.
+#### Agent
+Copy powerdns-recursor to the `/usr/lib/check_mk_agent/local` directory.
+The user check_mk is running as must be able to run `rec_control get-all`

doc/mkdocs.yml

@@ -0,0 +1,4 @@
+site_name: LibreNMS
+docs_dir: /home/murrant/projects/librenms/doc
+pages:
+- Home: index.md