Build scripts for building multiple applications from parent location

Before you run/use the script
- download sdk and update sdkmanager with latest API plaforms
- download latest ndk

Run 'source envsetup.sh' to set
- android source directory
- android sdk
- android ndk
- out directory

e.g.
(Note: one can also run the script directory, script will ask for inputs)

source envsetup.sh --sdk "sdk path" --ndk "ndk path" --and "android source"
--approot "where applications are clonned" --out "out directory for final apks"

Once, environment is set run
$ ndk-build

What is next?
- Script is verified with k9mail app
- need to add support for upcoming apps
- need to add support to checkout app with respected branch to build