examples(node-manual): add nodejs sample with manual instructions (#1842

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examples/quick-start-nodejs-manual-instrumentation/.gitignore

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+node_modules
+.DS_Store

examples/quick-start-nodejs-manual-instrumentation/Dockerfile

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+FROM node:slim
+WORKDIR /usr/src/app
+COPY package*.json ./
+RUN npm install
+COPY . .
+EXPOSE 8080
+CMD [ "npm", "run", "with-grpc-tracer" ]

examples/quick-start-nodejs-manual-instrumentation/app.js

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+const opentelemetry = require('@opentelemetry/api')
+const tracer = opentelemetry.trace.getTracer('quick-start-nodejs-manual-instrumentation-tracer')
+
+const express = require('express')
+const app = express()
+
+app.get('/', (req, res) => {
+  const span = tracer.startSpan('Hello World')
+  span.end()
+  res.send('Hello World')
+})
+
+app.get('/books', booksListHandler)
+
+function booksListHandler(req, res) {
+  const span = tracer.startSpan('Books List')
+  const books = getBooks()
+  span.setAttribute('books.list.count', books.length)
+  span.end()
+
+  res.json(books)
+}
+
+function getBooks() {
+  return [
+    {
+      id: 1,
+      title: 'Harry Potter',
+      isAvailable: 0,
+    },
+    {
+      id: 2,
+      title: 'Foundation',
+      isAvailable: 0,
+    },
+    {
+      id: 3,
+      title: 'Moby Dick',
+      isAvailable: 0,
+    },
+  ]
+}
+
+app.listen(8080, () => {
+  console.log(`Listening for requests on http://localhost:8080`)
+})

examples/quick-start-nodejs-manual-instrumentation/docker-compose.yaml

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+version: '3'
+services:
+  app:
+    image: quick-start-nodejs
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    build: .
+    ports:
+      - "8080:8080"