Add number and gcd in lib
	new file:   .gitignore
	new file:   README.md
	new file:   composer.json
	new file:   composer.lock
	new file:   src/Lovenunu/Math/GCD.php
	new file:   src/Lovenunu/Math/Number.php
	new file:   tests/Lovenunu/Math/NumberTest.php
	new file:   tests/bootstrap.php