Add basic example auth plugin that checks the NoVNC token from the

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other/js/auth_plugin_examples.js

@@ -0,0 +1,27 @@
+/*
+ * An auth plugin must be a function which returns a function conforing to the
+ * requirements of the `verifyClients` option on ws.WebSocket.Server.
+ *
+ * See: https://github.com/websockets/ws/blob/master/doc/ws.md
+ *
+ * If websockify is provided with an --auth-source argument, this will be
+ * passed to the auth plugin as its first argument.
+ *
+ */
+
+const querystring = require('querystring');
+
+exports.tokenAuth = function tokenAuth(source) {
+    return function(info) {
+        console.log(info.req.url);
+        let splitUrl = info.req.url.split("?")
+        if (splitUrl.length !== 2) {
+            return false;
+        }
+        let qs = splitUrl[1];
+        let qs_parsed = querystring.parse(qs)
+        console.log(qs_parsed)
+        return (qs_parsed.token === source);
+    }
+}
+