Add example json files

Author: Jiaxin Fan

…rs/standalone/helloworld/helloworld.json …users/standalone/helloworld/js-init.jsondocs/users/standalone/helloworld/helloworld.json renamed to docs/users/standalone/helloworld/js-init.json docs/users/standalone/helloworld/helloworld.json renamed to docs/users/standalone/helloworld/js-init.json

@@ -0,0 +1,3 @@
+{
+    "value": { }
+  }

docs/users/standalone/helloworld/js-params.json

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+{
+    "value": {
+       "name": "js-helloworld-with-params",
+       "main" : "main",
+       "binary" : false,
+       "code" : "function main(params) { return {payload: 'Hello ' + params.name + ' from ' + params.place + '!!!'} }"
+    }
+ }

docs/users/standalone/helloworldwithparams/js-init-params.json

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+{
+    "value": {
+       "name": "Visitor",
+       "place": "Earth"
+    }
+ }