Add Math spec with a few pending tests
user
```ruby
require File.expand_path(File.dirname(__FILE__) + '/spec_helper')

describe Math do

	it 'should solve a quadratic formula'
	it 'should get the number of permutations with n and k'
	it 'should get the number of combinations with n and k'
	it 'should get the number of steps to finish the Collatz Conjecture'
	it 'should get the length of a hypotenuse with the Pythagorean theorem'
	it 'should determine if three given numbers form a Pythagorean triplet'
	it 'should calculate a series of Fibonacci numbers of a specified length'

end
```
assistant