install Yii2

Setup Yii2 on Linux platform

Prerequisite
composer must be installed.

#### Clone repository ####
git clone https://github.com/yiisoft/yii2

#### Setup Yii2 advanced application ####
#### Change to advanced direcoty ####
cd yii2/apps/advanced
#### Install dependancies ####
composer install
### Setup Yii2 advanced application in development mode ####
php init --env=Development --overwrite=n

Run:
Set cookieValidationKey in yii2/apps/advanced/frontend/config/main.php
http://localhost/yii2/apps/advanced/frontend/web/index.php

#### Setup Yii2 basic application ####
#### Change to basic direcoty ####
cd yii2/apps/basic
#### Install dependancies ####
composer install
### Setup Yii2 basic application in development mode ####
php init --env=Development --overwrite=n

Run:
Set cookieValidationKey in yii2/apps/basic/config/main.php
http://localhost/yii2/apps/basic/web/index.php