new icon: testingicon (original, plain) [TESTING DO NOT MERGE]

[Thomas-Boi]

No description provided.

[github-actions]

Hi!

I'm Devicons' SVG-Checker Bot and it seems we've ran into a problem. I'm supposed to check your svgs but I couldn't do my task due to an issue.

Here is what went wrong:

Errors found in these files:
testingicon-original.svg:
-contains style declaration using 'fill' -> Replace classes with the 'fill' attribute instead

testingicon-plain.svg:
-contains style declaration using 'fill' -> Replace classes with the 'fill' attribute instead

testingicon2-original.svg:
-contains style declaration using 'fill' -> Replace classes with the 'fill' attribute instead

testingicon2-plain.svg:
-contains style declaration using 'fill' -> Replace classes with the 'fill' attribute instead

For more reference, check out our CONTRIBUTING guide

Please address these issues. When you update this PR, I will check your SVGs again.

Thanks for your help,
SVG-Checker Bot 😄

PS. One day, I will be smart enough to fix these errors for you 😣. Until then, I can only point them out.