Added readme

README.md

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+# IoT IP Beacon
+
+Simple daemon that helps you find your lost IoT device on the open sea of IP addresses.
+
+## How it works?
+
+This simple daemon broadcast some basic system information every 10 seconds to the local subnet.
+
+These information are the following:
+ - Configured IP address of the sending interface
+ - Hostname
+ - Birbox software version
+ - Uptime
+
+The messages is formed as the following UTF-8 encoded string:
+```
+BIRBOX|{ipaddr}|{hostname}|{version}|{uptime}
+```
+
+The messages are broadcast to the 6969 UDP port.
+
+All you need is to listen to such packets on the network, so you can find your lost IoT device in no time.
+
+## Usage
+
+Just start the script as a system daemon. You may have to change the interface name.