[Feature]Please Add more detailed Examples about ABAC

[josephusmv]

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Very obviously, your documents and examples about ABAC nearly NOTHING! No mention that the casbin ABAC is not using any standard XACML implmentations.

I think it's not a bad thing to use a customized PML, that's fine. But you need to let people more easy to know how to use it, rather than users try it by testing to found out how to use it.

It's obviously not to complex for your engineers to write more examples about your ABAC. But it's quite a borden for people to known how to write its rules and confs.
Please add this, it's really not a tough work at All.

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[casbin-bot]

@tangyang9464 @closetool @sagilio

[hsluoyz]

@tangyang9464 @EmperorYP7 we can add more complicated and real examples to the docs site.

[EmperorYP7]

Sure, there are many places where we need to add more docs, examples, and tutorials to help understand the flows for Casbin.

[casbin-bot]

@tangyang9464 @JalinWang @imp2002