Add examples for automatic tracing on Stackdriver and Zipkin

Author: luanamartinssantos

examples/stackdriver/automatic.ts

@@ -0,0 +1,9 @@
+var fs = require('fs');
+var tracing = require('opencensus-nodejs').addStackdriver('project-id').start();
+
+var http = require('http');
+http.createServer(function (req, res) {
+    res.writeHead(200, { 'Content-Type': 'text/html' });
+    res.write('Hello World!');
+    res.end();
+}).listen(8080);

examples/stackdriver/package-lock.json

@@ -0,0 +1,11 @@
+{
+  "name": "stackdriver",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Google Inc.",
+  "license": "Apache-2.0"
+}

examples/stackdriver/package.json

@@ -0,0 +1,11 @@
+var fs = require('fs');
+var tracing = require('opencensus-nodejs').addZipkin('http://localhost:9411/api/v2/spans', 'automatic_service');
+tracing.start();
+
+
+var http = require('http');
+http.createServer(function (req, res) {
+    res.writeHead(200, { 'Content-Type': 'text/html' });
+    res.write('Hello World!');
+    res.end();
+}).listen(8080);

examples/zipkin/automatic.ts

@@ -0,0 +1,14 @@
+{
+  "name": "zipkin",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Google Inc.",
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "@types/node": "^9.6.1"
+  }
+}