Adding documentation on methods and attributes.

[hiuryoliveira]

Hello my friend.
I would like to congratulate you on the great work with this plugin. I would like to add some feature issues, and patterns that would be important in the use of my project.

My first contribution is adding documentation for methods and attributes.

[pelmered]

Thank you @hiuryoliveira!
I'm normally not a fan of comments on all the methods and attributes as I think mostly just adds noise and clutter, and with type hints and good naming of the methods I find that they add little value. However, in an open source package like this one it might add some more value.

I'm willing to merge if you can make a good case for this.

[hiuryoliveira]

@pelmered, I reflected a little more on what you told me, and I have to agree. But what do you think if we add declare(strict_types=1) ?

[pelmered]

@hiuryoliveira Yes, strict types would be nice. I would accept an PR for that if it does not break anything.