Document Typical "Trust Policy" examples that customers may encounter.

[iamsamirzon]

For Notation's RC-1 release, lets create a sample of trust policy templates, that customers can use as a reference to build their trust policies.

These examples should be based on real world examples

[iamsamirzon]

@toddysm - Assigning this one to you first. We all can add other examples later.

cc: @vaninrao10

[toddysm]

@iamsamirzon Please take a look at the linked PR.

BTW, the PR is for main branch. I wasn't sure whether I should make it for main or rc.1 or some other branch. Not sure what the convention here is.