Add HackRF to the README.

Author: ryanvolz

README.md

@@ -17,14 +17,16 @@ and support for the following SDR devices and device libraries:
 |    [ADALM-PLUTO][1]     |       libiio ([setup](#iio-pluto-sdr))        |
 | [Airspy R2/Mini/HF+][2] | airspy/airspyhf ([setup](#airspy-r2-mini-hf)) |
 |    [Ettus USRPs][3]     |        UHD ([setup](#uhd-ettus-usrp))         |
+|       [HackRF][4]       |           HackRF ([setup](#hackrf))           |
 |      [LimeSDR][4]       |        Lime Suite ([setup](#limesdr))         |
 |      [RTL-SDR][5]       |          rtl-sdr ([setup](#rtl-sdr))          |
 
 [1]: https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/adalm-pluto.html
 [2]: https://airspy.com/
 [3]: https://www.ettus.com/products/
-[4]: https://limemicro.com/products/boards/
-[5]: https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/
+[4]: https://greatscottgadgets.com/hackrf/
+[5]: https://limemicro.com/products/boards/
+[6]: https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/
 
 The complete list of packages can be found [here](https://github.com/ryanvolz/radioconda/blob/master/radioconda.yaml). You can [**suggest additional software to include**](https://github.com/ryanvolz/radioconda/issues) by filing an [issue](https://github.com/ryanvolz/radioconda/issues). If you've built additional software from source on top of radioconda, [**document your results**](https://github.com/ryanvolz/radioconda/issues) in an [issue](https://github.com/ryanvolz/radioconda/issues) to help others (and help me in packaging it!).
 
@@ -187,6 +189,26 @@ Then, make sure your user account belongs to the plugdev group in order to be ab
 
 You may have to restart for this change to take effect.
 
+### HackRF
+
+##### Windows users
+
+[Install the WinUSB driver with Zadig](#installing-the-winusb-driver-with-zadig), selecting your HackRF device.
+
+##### Linux users
+
+Install a udev rule by creating a link into your radioconda installation:
+
+    sudo ln -s $CONDA_PREFIX/lib/udev/rules.d/53-hackrf.rules /etc/udev/rules.d/53-radioconda-hackrf.rules
+    sudo udevadm control --reload
+    sudo udevadm trigger
+
+Then, make sure your user account belongs to the plugdev group in order to be able to access your device:
+
+    sudo usermod -a -G plugdev <user>
+
+You may have to restart for this change to take effect.
+
 ### LimeSDR
 
 ##### Windows users