add requirements-info to README; add convenience Makefile

Makefile

@@ -0,0 +1,20 @@
+
+
+build:
+	docker-compose run compile 
+
+
+clean: 
+	rm docker-compose-build.log || true
+	docker-compose down --remove-orphans --rmi all
+
+apk: apk/app.apk
+	true
+
+apk/app.apk: docker-compose-build.log 
+	docker-compose run compile 
+
+docker-compose-build.log: Dockerfile docker-compose.yml
+	docker-compose down --remove-orphans --rmi all
+	BUILDKIT_PROGRESS=plain docker-compose build --no-cache | tee docker-compose-build.log 
+

README.md

@@ -16,6 +16,12 @@ docker-compose run compile
 
 this should result in the apk being build and be available at `./apk/app.apk`
 
+## Dependencies / Requirementes
+
+Ideally to work the system mus have `docker` and `docker-compose` (or some equivalend like `podman` etc.)
+installed. Having GNU make installed would allow to use the contained Makefile, which however is not necessary 
+
+
 ## Concepts and Ideals
 
 Many smart folks use [Android Studio](https://en.wikipedia.org/wiki/Android_Studio) IDE to build
@@ -47,4 +53,3 @@ docker-compose build --no-cache
 ```
 
 
-