created weather.js in node.js examples, modified README.md (#394)

examples/nodejs/weather.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const rp = require('request-promise-native');
+
+module.exports = async function (context) {
+    const stringBody = JSON.stringify(context.request.body);
+    const body = JSON.parse(stringBody);
+    const location = body.location;
+
+    if (!location) {
+        return {
+            status: 400,
+            body: {
+                text: 'You must provide a location.'
+            }
+        };
+    }
+
+    try {
+        const response = await rp(`https://query.yahooapis.com/v1/public/yql?q=select item.condition from weather.forecast where woeid in (select woeid from geo.places(1) where text="${location}") and u="c"&format=json`);
+        const condition = JSON.parse(response).query.results.channel.item.condition;
+        const text = condition.text;
+        const temperature = condition.temp;
+        return {
+            status: 200,
+            body: {
+                text: `It is ${temperature} celsius degrees in ${location} and ${text}`
+            },
+            headers: {
+                'Content-Type': 'application/json'
+            }
+        };
+    } catch (e) {
+        console.error(e);
+        return {
+            status: 500,
+            body: e
+        };
+    }
+}