Add Development section to README

Author: BigBlueHat

README.md

@@ -55,3 +55,17 @@ This will install `http-server` globally so that it may be run from the command
 `-r` or `--robots` Provide a /robots.txt (whose content defaults to 'User-agent: *\nDisallow: /')
 
 `-h` or `--help` Print this list and exit.
+
+# Development
+
+Checkout this repository locally, then:
+
+```sh
+$ npm i
+$ node bin/http-server
+```
+
+*Now you can visit http://localhost:8080 to view your server*
+
+You should see the turtle image in the screenshot above hosted at that URL. See
+the `./public` folder for demo content.