Change minimum requirements and add FreeBSD installation guide

docs/freebsd-installation.markdown

@@ -0,0 +1,56 @@
+Freebsd Installation
+====================
+
+Freebsd 10
+----------
+
+```bash
+pkg update
+pkg upgrade
+
+# Install PHP with some standard extensions
+pkg install wget unzip mod_php55 \
+    php55-session php55-pdo_sqlite php55-pdo \
+    php55-openssl php55-opcache php55-mbstring \
+    php55-json php55-curl php55-mcrypt \
+    php55-zlib php55-simplexml php55-xml php55-filter \
+    php55-iconv php55-dom php55-ctype
+```
+
+Check if PHP is correctly installed:
+
+```bash
+$ php -v
+PHP 5.5.19 (cli) (built: Nov 19 2014 04:37:37)
+Copyright (c) 1997-2014 The PHP Group
+Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
+    with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2014, by Zend Technologies
+```
+
+Enable Apache in your `/etc/rc.conf`:
+
+```bash
+echo apache24_enable="YES" >> /etc/rc.conf
+```
+
+Setting up PHP for Apache, just add those lines into `/usr/local/etc/apache24/Includes/php.conf`:
+
+```bash
+AddType application/x-httpd-php .php
+DirectoryIndex index.php index.html
+```
+
+Then start Apache:
+
+```
+service apache24 start
+```
+
+Install Kanboard:
+
+```bash
+wget http://kanboard.net/kanboard-latest.zip
+unzip kanboard-latest.zip
+chown -R www:www kanboard/data
+rm kanboard-latest.zip
+```