Update README.md

README.md

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 # Buildroot Camera RPi
 
+## Installation
+
+### Download Release
+
+Download a pre-build [release](https://github.com/moritzmhmk/buildroot-camera-rpi/releases) and flash it to a sd card (e.g. using [Etcher](https://etcher.io/))
+
+### Build a custom version
+
+Clone Repo and submodules
+```bash
+git clone https://github.com/moritzmhmk/buildroot-camera-rpi
+cd buildroot-camera-rpi
+git submodule init
+git submodule update
+```
+
+Run `make xconfig`, make changes, save and then close window.
+
+Run `make all` and wait about 2h :coffee:
+
+The resulting image can be found in `output/images`.
+
+## Configuration
+Configuration files can be found on the `boot` partition of the SD card.
+
+### Camera
+``homebridge-camera-rpi.conf.json`` contains the configuration for [homebridge-camera-rpi](https://github.com/moritzmhmk/homebridge-camera-rpi)
+
+### WiFi
+``wpa_supplicant`` - is a folder containing configurations in the format ``wpa_supplicant-INTERFACE.conf``
+
+These are normal wpa_supplicant config files. ``INTERFACE`` should be ``wlan0`` if only one wifi dongle is attached.
+
 ## License
 
 ### buildroot-submodule