update README.md for minimal example app

README.md

@@ -2,7 +2,34 @@
 
 ## tl;dr
 
-to build an application
+to `make` minimal exmaple.app via the docker-compose:
+```
+# clone repo
+git clone https://git.alexmahr.de/lion/android-app-docker
+# enter local copy
+cd android-app-docker
+# checkout the branch for minmal-example-app
+git checkout minimal-example-app
+# set env variable
+export YESACCEPT=y #to acceccpt the license agreement terms (it is your responsibility to read it)
+# build app (this involves first building the docker compose setup and container used to build the apk)
+make build
+```
+
+This will generate the APK file `./apk/example.app.apk`
+
+this can be installed via `adb`
+```
+adb install -r ./apk/exmple.app.apk 
+# or alternative type
+make install
+```
+which of course would require your mobile device to be connected and setup for USB-debugging.
+
+
+## a bit longer
+
+build an application
 
 0. build the image _*_ 
 ```sh