Update README (#344)

Simple general and startup description

README.md

@@ -1,4 +1,34 @@
 # netdisco
-
 [![Build Status](https://travis-ci.org/netdisco/netdisco.svg?branch=master)](https://travis-ci.org/netdisco/netdisco)
 [![CPAN version](https://badge.fury.io/pl/App-Netdisco.svg)](https://metacpan.org/pod/App::Netdisco)
+
+## Description
+Netdisco is a web-based network management tool designed for network
+administrators. Data is collected into a PostgreSQL database using SNMP.
+
+Some of the things you can do with Netdisco:
+
+* Locate a machine on the network by MAC or IP and show the switch port it lives at
+* Turn off a switch port, or change the VLAN or PoE status of a port
+* Inventory your network hardware by model, vendor, software and operating system
+* Pretty pictures of your network
+
+App::Netdisco provides a web frontend with built-in web server, and a backend
+daemon to gather information from your network, and handle interactive
+requests such as changing port or device properties.
+
+## Startup
+Start the web-app server (accessible on port 5000)
+```bash
+~/bin/netdisco-web start
+```
+Start the daemon
+```bash
+netdisco$ ~/bin/netdisco-backend start
+```
+
+Main resource:
+ - [Main documentation on metacpan](https://metacpan.org/pod/App::Netdisco)
+ 
+Other resources:
+- [Github wiki](https://github.com/netdisco/netdisco/wiki)