add docker build env

README.md

@@ -57,3 +57,11 @@ Decompile the same APK to `./out_orig/` and do you chancges in `./out/`
 sh generate_patch_diff.sh
 ```
 You may want to add a different app version like `android:versionCode='18101' android:versionName='3.8.1_2026.7.7'` to the `AndroidManifest.xml` file, otherwise the version which will be displayed in app info will be `3.8.1`.
+
+## Docker
+
+The docker image contains all needed tools to decompile/compile an APK.
+
+- Build the image: `docker compose build`
+- Run the container: `docker compose up -d`
+- Enter the container: `docker compose exec bejeweled-env bash`