Future plans for the Example package

[olexandr-konovalov]

After gap-system/gap#484 has been merged, this package will not have guidelines. It will be a mock package which should demonstrate how to apply those guidelines. I think it should be made closer to look like what https://github.com/gap-system/PackageMaker would create, and it should demonstrate how to use Travis CI and CodeCov to run regression tests and get code coverage reports. That will increase its value, as it will demonstrate to PackageMaker users where to go from the stub package that PackageMaker will produce for them, and show to package authors how to set up CI and code coverage tools.