initial implementation: nes

Author: anna239

Cargo.toml

@@ -17,6 +17,7 @@ include = ["/src/**/*.rs", "/README.md", "/LICENSE", "/Cargo.toml"]
 unstable = [
     "unstable_auth_methods",
     "unstable_cancel_request",
+    "unstable_nes",
     "unstable_elicitation",
     "unstable_logout",
     "unstable_session_fork",
@@ -29,6 +30,7 @@ unstable = [
 ]
 unstable_auth_methods = []
 unstable_cancel_request = []
+unstable_nes = []
 unstable_elicitation = []
 unstable_logout = []
 unstable_session_fork = []