Add example policy with trusted list

example/examplePolicy/1.2/data.json

+{
+  "trustlist": [
+    "did:web:123",
+    "did:web:abc"
+  ]
+}
\ No newline at end of file

example/examplePolicy/1.2/policy.rego

+package example.examplePolicy
+
+import future.keywords.in
+
+default trusted = false
+
+trusted{
+    issuer := input.issuer
+    issuer in data.trustlist
+}
\ No newline at end of file