Add continuous integration tools

[marcusesa]

Description

The main reason to make this PR was add php quality tools and integrate it with vendors to monitor qedu-hub source code quality.

Motivation and context

Until now, we don't have a dedicated service to run the build and test qedu-hub application, which means less visibility about fails. Also we need more tools to control source code quality.

Have been included the following quality tools:

• PDepend: command to run composer pdepend
• PHPLoc: command to run composer phploc
• PHPMD: command to run composer phpmd
• PHPCPD: command to run composer phpcpd
• PHPCS: command to run composer check-style using PSR2

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Screenshots