added gadgetbridge entry

wiki/android/gadgetbridge.md

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+# Gadgetbridge
+
+[Gadgetbridge](https://codeberg.org/Freeyourgadget/Gadgetbridge/) is a free and open source software
+for [Android](/wiki/android.md) systems.
+It is a cloudless replacement for gadgets proprietary applications.
+
+## Setup
+
+To install F-Droid simply download and install the
+[package](https://f-droid.org/packages/nodomain.freeyourgadget.gadgetbridge/).
+
+## Usage
+
+The following section addresses different uses and the configuration of different devices in
+Gadgetbridge.
+
+### Configuration of Devices
+
+Devices can be added to Gadgetbridge by clicking on the `+` in the main screen.
+Afterwards the device can simply be paired.
+
+A special pairing procedure is needed for Huami, Amazfit or Xiaomi devices.
+The following describes the steps that need to be done.
+
+- Download the
+  [Zepp app](https://play.google.com/store/apps/details?id=com.huami.watch.hmwatchmanager).
+- Pair the device with the Zepp app.
+- Use [huami-token](https://codeberg.org/argrento/huami-token/) to obtain the auth key by using the
+  command `python3 huami_token.py --method amazfit --email my_email --password password --bt_keys`
+  with adjusted values.
+- Uninstall the Zepp app and unpair the device from inside the bluetooth settings of the smart
+  phone.
+- Inside the Gadgetbridge app click on the `+`, find the device and enter the auth key by long
+  pressing on the devices name.
+  Afterwards navigate back to the scanning list.
+- Pair the device by clicking on the device name.
+
+Afterwards the device will be paired and connected.
+
+### Add Weather Function
+
+For correct displaying of weather data an additional app is needed.
+An example for this is the
+[Weather notification app](https://f-droid.org/en/packages/ru.gelin.android.weather.notification/).
+Install it, check the Gadgetbridge option inside the Weather notification app to on and set the
+location.
+Finally create an account at [OpenWeather](https://home.openweathermap.org).
+On that website create an API key and paste it into the according setting in the Weather
+notification app.
+Afterwards the weather function will be working.