Added KB about adb and fastboot

knowledge base/android.md

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+# Android
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+
+## TL;DR
+
+```sh
+# List attached devices.
+adb devices
+adb devices -l
+
+# Download files from an attached device.
+adb pull '/path/to/device/file.img'
+adb -s 'device_serial' pull '/path/to/device/file.img' '/path/to/local/file.img'
+
+# Upload files to an attached device.
+adb push 'path/to/local/file.img' 'path/to/device/dir'
+
+# Install an application.
+adb install 'path/to/file.apk'
+adb -s 'device_serial' install 'path/to/file.apk'
+
+# Issue shell commands.
+adb shell 'command'
+
+# Reboot devices to their 'fastboot' mode.
+adb reboot bootloader
+
+# Reset `adb` on the local host.
+adb kill-server
+```
+
+With the device in fastboot mode:
+
+```sh
+# List attached devices.
+fastboot devices
+
+# Unlock the bootloader.
+fastboot flashing unlock
+fastboot oem unlock
+
+# Lock the bootloader.
+fastboot flashing lock
+fastboot oem lock
+
+# Flash a recovery image.
+fastboot flash recovery 'path/to/recovery.img'
+
+# Flash a boot image.
+fastboot flash boot 'path/to/boot.img'
+
+# Reboot to 'system' mode.
+fastboot reboot
+```
+
+## Further readings
+
+- [ADB]
+- [How to Use ADB and Fastboot on Android]
+- [Using ADB and fastboot]
+
+<!-- project's references -->
+[adb]: https://developer.android.com/studio/command-line/adb
+
+<!-- internal references -->
+<!-- external references -->
+[how to use adb and fastboot on android]: https://www.makeuseof.com/tag/use-adb-fastboot-android/
+[using adb and fastboot]: https://wiki.lineageos.org/adb_fastboot_guide