Document proposal for acl:agentClass acl:PayingAgent (#100)

Document proposal for acl:agentClass acl:PayingAgent

Co-authored-by: Sarven Capadisli <[email protected]>

Author: michielbdejong

proposals/paying-agent.md

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+### The 'Paying Agent' agent class
+
+**Note:** This proposal is still experimental, and clients cannot rely
+on it yet. See the [Test Suite report](https://github.com/solid/test-suite#table)
+for the latest information on which servers currently support it.
+
+The current WAC spec defines two agent classes:
+* `foaf:Agent` (allows access to any agent, i.e., the public)
+* `acl:AuthenticatedAgent` (allows access to any authenticated agent)
+
+This proposal adds a third one:
+* `acl:PayingAgent` (allows access to any paying agent)
+
+For more information about how to use this agent class in combination with
+the `402 Payment Required` http response code and the `Pay` http response header,
+and about how to determine whether a given WebID
+is a paying agent for a given resource, see
+[Solid Webmonetization](https://github.com/solid/webmonetization/blob/main/README.md#requiring-payment-for-resources).