Create demonstrations of using trestle as a pre-commit hook.

[butler54]

As a trestle user it would be fantastic if trestle can run , for certain operations, as a pre-commit hook.

Trestle is not optimised for pre-commit, however, pre-commit can easily be configured for trestle. Provide an example in the compliance-trestle-demos project.

[butler54]

Based on the way trestle is working I recommend that we change this to a documentation issue.

[vikas-agarwal76]

Do validation using trestle during commit.