Added processing(.pde) icon.

[JotaroS]

Hi,
I added Processing (https://processing.org/) icon.
Processing is the under GPLv2 license.
The icon is from the latest version of Processing app.

[JotaroS]

@PKief Please review, thank you.

[PKief]

I would prefer to use two different icons, one for a light background and another one for the dark background. And I think it is better to use no dark circle as a background for this icon. The dark circle as the background will be not visible on a dark background and on a light background it will be to prominent.

It looks more simple and clean if we make it like this:

Light:

Dark:

Would that be okay with you?

[JotaroS]

@PKief Wow that's fantastic. and yes, I was a bit worried about the background.
How can I do for this? or you do instead?
(If there's any guideline for making dark/light icon that will also be great!)

[PKief]

@JotaroS I've already changed the icons and I'll merge your pull request soon. So you don't have to do anything else. But thank you for the pull request at all 😃

[JotaroS]

Great! Thank you for your help.

[PKief]

Merged with 0c3277d.

[JotaroS]

Vielen Dank!