Prepare an empty Gradle build

[robmoore-i]

The project should use a Gradle build of the appropriate structure:

• A multi-module project with no root build
• An included build plugins module defined under gradle/plugins, alongside the wrapper

Review

https://github.com/codeday-hom/hit-or-miss/commit/57673cb34cfd08d8cd1b650bdcd699ce670f3d84