Make a collection of scripts for global configuration

[buep]

Collect all the work we have done internally and a customers doing groovy snippets that make Jenkins global configuration.

Place them in an example directory, or with the existing script and explain how to include them and use them without problem when we update them.

I can't edit the scripts supplied by the repository, but maybe inherit them, so when I pull changes from JenkinsAsCodeReference to my local instance, only the default ones are overwritten.