beginners-guide-android.md does not lead to working/compiling lqml

If you follow the file you do not end up with a working setup.

The process in readme-build.md assumes an actual install of ecl so that the libs and includes can be found in the default places (i.e. /usr/local/include or similar), but the scripts in readme-prepare-android.md only put ecl compiled for android and the host in ./lqml/platforms/android/build-ecl and ./lqml/platforms/android/build-ecl-host and do not install anything.

I've managed to work around this by adding the correct include and lib path to the provided .pro files, which I think is probably the correct way (instead of installing it globally), but then I end up with other issues (QtAndroid include fails, which seems to be a Qt5/Qt6 issue, but that is not relevant here).

Anyway, I think it would be good if the provided readme's actually contain a path that ends up working correctly if you follow all the steps as they are given.