Update Installtion section on README

README.md

@@ -4,6 +4,20 @@
 [![Coverage Status](https://coveralls.io/repos/github/peter279k/work-home-schedule/badge.svg?branch=master)](https://coveralls.io/github/peter279k/work-home-schedule?branch=master)
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+## Installation
+
+- Download `composer` firstly:
+
+```BASH
+curl -sS https://getcomposer.org/installer | php
+```
+
+- Install `lee/work-home-schedule` secondly:
+
+```BASH
+php composer.phar require lee/work-home-schedule:^1
+```
+
 ## Introduction
 
 This is about working home schedule to estimate current working status on specific date.