Add install procedure for Centos 7

docs/centos-installation.markdown

@@ -4,17 +4,47 @@ Centos Installation
 Centos 7
 --------
 
+Install PHP and Apache:
 
+```bash
+yum install -y php php-mbstring php-pdo unzip wget
+```
+
+By default Centos 7 use PHP 5.4.16 and Apache 2.4.6.
+
+Restart Apache:
+
+```bash
+systemctl restart httpd.service
+```
+
+Install Kanboard:
+
+```bash
+cd /var/www/html
+wget http://kanboard.net/kanboard-latest.zip
+unzip kanboard-latest.zip
+chown -R apache:apache kanboard/data
+rm kanboard-latest.zip
+```
+
+If SeLinux is enabled, be sure that the Apache user can write to the directory data:
+
+```bash
+chcon -R -t httpd_sys_content_rw_t /var/www/html/kanboard/data
+```
 
 Centos 6.5
 ----------
 
-Install PHP:
+Install PHP and Apache:
 
 ```bash
-yum install -y php php-mbstring php-pdo unzip
+yum install -y php php-mbstring php-pdo unzip wget
 ```
 
+By default Centos 6.5 use PHP 5.3.3 and Apache 2.2.15.
+
 Enable short tags:
 
 - Edit the file `/etc/php.ini`