build: add book creation

Author: amejiarosario

.circleci/config.yml

@@ -10,25 +10,25 @@ jobs: # a collection of steps
           name: update-npm
           command: 'sudo npm install -g npm@latest'
       - run:
-          name: Check current version of node
+          name: node version
           command: node -v
       - run:
-          name: Check current version of NPM
+          name: NPM version
           command: npm -v
 
       - restore_cache: # special step to restore the dependency cache
           # Read about caching dependencies: https://circleci.com/docs/2.0/caching/
           key: dependency-cache-{{ checksum "package.json" }}
       - run:
-          name: install-npm-wee
+          name: npm install
           command: npm install
       - save_cache: # special step to save the dependency cache
           key: dependency-cache-{{ checksum "package.json" }}
           paths:
             - ./node_modules
 
       - run: # run tests
-          name: test
+          name: run tests
           command: npm run ci
 
       - store_artifacts: # special step to save test results as as artifact
@@ -40,3 +40,22 @@ jobs: # a collection of steps
           prefix: coverage
       - store_test_results: # for display in Test Summary: https://circleci.com/docs/2.0/collect-test-data/
           path: test-results.xml
+
+  book:
+    docker:
+      - image: circleci/ruby:2.5.3-stretch
+    steps:
+      - checkout
+      - run:
+          name: bundler version
+          command: bundle -v
+      - run:
+          name: ruby version
+          command: ruby -v
+
+workflows:
+  version: 2
+  build_and_test:
+    jobs:
+      - build
+      - book

README.md

@@ -1,6 +1,6 @@
 # Data Structures and Algorithms in JavaScript
 
-[![Build Status](https://travis-ci.com/amejiarosario/dsa.js.svg?branch=master)](https://travis-ci.com/amejiarosario/dsa.js) [![NPM version](https://badge.fury.io/js/dsa.js.svg)](https://badge.fury.io/js/dsa.js) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](http://makeapullrequest.com) [![Code Style Airbnb](https://img.shields.io/badge/code%20style-Airbnb-brightgreen.svg)](https://github.com/airbnb/javascript)
+[![CircleCI](https://circleci.com/gh/amejiarosario/dsa.js.svg?style=svg)](https://circleci.com/gh/amejiarosario/dsa.js) [![NPM version](https://badge.fury.io/js/dsa.js.svg)](https://badge.fury.io/js/dsa.js) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](http://makeapullrequest.com) [![Code Style Airbnb](https://img.shields.io/badge/code%20style-Airbnb-brightgreen.svg)](https://github.com/airbnb/javascript)
 [![ProductHunt](https://img.shields.io/badge/product%20hunt-vote-orange.svg)](https://www.producthunt.com/posts/dsa-js)
 
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