Improve Android install instructions (#3332)

Also update devilutionx.mpq, and mention fonts.mpq and pl.mpq

docs/installing.md

@@ -3,10 +3,35 @@
 First, you will need access to the game MPQ files.
 - First, locate `DIABDAT.MPQ` on your CD or in the GoG installation (or [extract it from the GoG installer](https://github.com/diasurgical/devilutionX/wiki/Extracting-the-.MPQs-from-the-GoG-installer)).
 - For the Diablo: Hellfire expansion you will also need `hellfire.mpq`, `hfmonk.mpq`, `hfmusic.mpq`, `hfvoice.mpq`.
-- Lastly, DevilutionX comes with [devilutionx.mpq](https://github.com/diasurgical/devilutionX/raw/1.2.1/Packaging/resources/devilutionx.mpq) which you will also need.
+- DevilutionX comes with [devilutionx.mpq](https://github.com/diasurgical/devilutionx-assets/releases/download/v1/devilutionx.mpq) which is also needed.
+- Chinese, Korean, and Japanese users will also need [fonts.mpq](https://github.com/diasurgical/devilutionx-assets/releases/download/v1/fonts.mpq) or the text will be missing.
+- For Polish voice support you need [pl.mpq](https://github.com/diasurgical/devilutionx-assets/releases/download/v1/pl.mpq)
 
 Download the latest [DevilutionX release](https://github.com/diasurgical/devilutionX/releases) for your system (if available) and extract the contents to a location of your choosing, or [build from source](building.md). Then follow the system-specific instructions below.
 
+<details><summary>Android</summary>
+
+First install the App via one of these 3 methods:
+  - [Google Play](https://play.google.com/store/apps/details?id=org.diasurgical.devilutionx)
+  - Copy the APK file to the device and tap on it in the device's file explorer and follow the instruction
+  - Install via `adb install` (if USB debugging is enabled on the device)
+
+Then launch the App, this will let it create the folder where you need to place the MPQ files.
+
+Connect the device to your computer via USB cable, and allow data access from your device:
+
+![image](https://user-images.githubusercontent.com/204594/139543023-3c45bb22-35f7-41af-8b3d-c714a9542d23.png)
+  
+Open the device's internal storage, and navigate to `Android/data/org.diasurgical.devilutionx/files`, then copy the MPQ-files to this folder.
+
+![image](https://user-images.githubusercontent.com/204594/139542962-4e776854-6ca4-4872-8ed6-6303fc4bf040.png)
+  
+When the transfer is done you can disconnect your device and press "Check again" in the App to start the game.
+
+![image](https://user-images.githubusercontent.com/204594/139541657-d8c1197d-fbef-42b6-a34f-2b17f1ceab5f.png)
+
+</details>
+
 <details><summary>Windows</summary>
 
 - Copy the MPQ files to the folder containing the DevilutionX exe, or to the data folder. The data folder path may differ, but will normally be `%AppData%\diasurgical\devilution`
@@ -59,13 +84,6 @@ sudo apt install devilutionx
 
 </details>
 
-<details><summary>Android</summary>
-
-- Copy the APK file to device and tap on it on device's file explorer or install via `adb install` (if USB debugging is enabled on device).
-- Place the MPQ-files in `/sdcard/Android/data/org.diasurgical.devilutionx/files` folder
-
-</details>
-
 <details><summary>New Nintendo 3DS</summary>
 
 ### .3dsx installation