Merge branch 'example-policies-signer-proofs' into 'main'

Create example policies for VC proof creation and verification

See merge request !20

example/createProof/1.0/policy.rego

+package example.createProof
+
+_ := proof.create(input)

example/verifyProof/1.0/policy.rego

+package example.verifyProof
+
+valid := proof.verify(input)