Improves documentation

docs/android/download_apks.md

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+# Downloading APKs from an Android phone
+
+In order to use `mvt-android` you need to connect your Android device to your computer. You will then need to [enable USB debugging](https://developer.android.com/studio/debug/dev-options#enable>) on the Android device.
+
+If this is the first time you connect to this device, you will need to approve the authentication keys through a prompt that will appear on your Android device.
+
+Now you can launch `mvt-android` and specify the `download-apks` command and the path to the folder where you want to store the extracted data:
+
+```bash
+mvt-android download-apks --output /path/to/folder
+```
+
+Optionally, you can decide to enable lookups of the SHA256 hash of all the extracted APKs on [VirusTotal](https://www.virustotal.com) and/or [Koodous](https://www.koodous.com). While these lookups do not provide any conclusive assessment on all of the extracted APKs, they might highlight any known malicious ones:
+
+```bash
+mvt-android download-apks --output /path/to/folder --virustotal
+mvt-android download-apks --output /path/to/folder --koodous
+```
+
+Or, to launch all available lookups::
+
+```bash
+mvt-android download-apks --output /path/to/folder --all-checks
+```