Document Enhancements for OPA and IDQL

[independentid]

We need to document the valid values for each of Subject, Action, Object and Conditions. For example, in Subject we will soon be using the format User|Domain|Role (see Issue #3 )

We should also document the opaTools Subject and Request parameters attributes that are passed into Rego. E.g. in Issue #3 there was the suggesting to use subject.type eq "jwt" to check that the user was authenticated via JWT token.