README missing instructions on how to execute bundletool

[MarkOSullivan94]

There's no step-by-step information contained within the README to go from cloning the tool to making use of it's functionality

There's resources which tell us what command to use (like the one below) but if we can't run bundletool in the first place then these instructions are pointless

bundletool build-apks --bundle=/MyApp/my_app.aab --output=/MyApp/my_app.apks

At the very least this question below along with an answer needs to be added to the README

Q: After cloning the repo how do I execute the bundletool tool?