Update "README.md".

Update "README.md" adding udevadm instructions and build status image.

README.md

 ![Kromek RadAngel](docs/Kromek_RadAngel.png)
 
 ## Daemon: radangel
+[![Build Status](https://drone.unino.de/api/badges/pvivell/radangel/status.svg)](https://drone.unino.de/pvivell/radangel)
+
 
 The `radangel` binary communicates with the RadAngel HID device (`04d8:0100`) via USB (`hidapi-libusb`) and uses threads (`pthreads`) to read events and push them in a queue, then pop them from the queue and write them into files.
 
 To grant permissions to the USB device, the udev system can be employed:
 
- `echo 'SUBSYSTEM=="usb", ATTR{idVendor}=="04d8", ATTR{idProduct}=="0100", MODE="0666"' | sudo tee /etc/udev/rules.d/99-kromek-radangel.rules`
+ * `echo 'SUBSYSTEM=="usb", ATTR{idVendor}=="04d8", ATTR{idProduct}=="0100", MODE="0666"' | sudo tee /etc/udev/rules.d/60-kromek-radangel.rules`
+ * `udevadm control --reload-rules && udevadm trigger`
 
 Compiling the radangel binary for the linux operating system is easy:
 Just run `make` in the `src` directory or