update screenshots and enhance readme

README.md

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-# web-scraping-mongodb
-News web scraper that stores links, notes, and favorites in MongoDB
+# Scrape news headlines into MongoDB
+
+This is a full-stack JavaScript app built using MongoDB, Mongoose, Node.js, Express.js, Handlebars.js, HTML, and CSS. It scrapes the  [TechCrunch](https://techcrunch.com/) homepage and stores article titles and links, along with your notes and favorites, in MongoDB. 
+
+https://mongo-tech-news-scraper.herokuapp.com/
+
+![screenshot of the homepage](/public/assets/img/home-screenshot.png)
+
+## Get new articles, save favorites, and write notes
+
+To see updated news stories, click `Get new articles` at the top of the `Home` page. To view the full article, click the `View article on TechCrunch` link. 
+
+When you see an article in the list that you want to mark as a favorite, click `Save article`, and read it again by clicking `Saved articles` in the top menu bar. After you have an article in your saved list, you can comment on it by clicking `Add note`.
+
+![Add notes to a page](/public/assets/img/add-note-screenshot.png)
+
+_Note: There is no login system, so all saved articles and comments are visible to and can be deleted by all users._
+
+## Local set up for development purposes
+
+These must be installed to run the app locally:
+
+- [Node.js](https://nodejs.org/en/)
+- [npm](https://www.npmjs.com/get-npm)
+
+You first need to make a local MongoDB database named `news`. Then, in a terminal window, navigate into the folder where you downloaded this app and type `npm install`. To start the app, type `node server.js` and open your browser to `localhost:3000`.
+
+## Technology
+
+- HTML, CSS, jQuery, Bootstrap, [Handlebars.js](https://handlebarsjs.com/)
+- JavaScript
+- Node.js
+- MongoDB and [Mongoose](http://mongoosejs.com/)
+- [Express.js](https://expressjs.com/)
+- npm, including [express](https://www.npmjs.com/package/express) and [body-parser](https://www.npmjs.com/package/body-parser) packages.
+- [cheerio](https://cheerio.js.org/) for scraping the website