Add installation code, readme, and test delay scraping startup

Author: Jack Li

README.md

@@ -1,2 +1,7 @@
 # ticket_tracker_api
 Serves as a back-end of concert ticket price tracking based on Ticketmaster real-time best seats. 
+
+### Installation
+- You must have preinstalled Node.js.
+- Run `install.sh` to install all required dependencies.
+- If __node-canvas__ in `node_modules` fails to install, please check if you have the correct prerequisite softwares installed on your machine. The detail can be found at https://github.com/Automattic/node-canvas/wiki#installation-guides based on your system.

install.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# install python dependencies
+pipenv install
+
+# check nodejs
+node --version
+
+# check canvas install prerequisites
+# sudo yum install gcc-c++ cairo-devel libjpeg-turbo-devel pango-devel giflib-devel
+
+# install node_modules
+npm --prefix ticketscraping/js ci