Add command line gif

Author: rrwen

README.md

@@ -1,2 +1,20 @@
 # tutorial-express-leaflet
+
+Richard Wen <rwen@ryerson.ca>  
+  
 A tutorial for creating a leaflet webmap with express in Node.js
+
+## 1. Install Software
+
+1. Install [Node.js](https://nodejs.org/)
+2. Install [express-generator](https://www.npmjs.com/package/express-generator) globally `-g` with [npm](https://docs.npmjs.com/cli/install)
+
+```
+npm install -g express-generator
+```
+
+## 2. Create a express project
+
+Open a [command line interface](https://en.wikipedia.org/wiki/Command-line_interface):
+
+![command_line](images/command_ling.gif)