Update index.md

[Mateusz-Nejman]

Please confirm this pull request meets the following requirements:

• I followed the contributing guidelines: https://github.com/github/explore/blob/main/CONTRIBUTING.md.
• I am not the sole author or employee of a company who created either the topic I am modifying/adding or the collection entry I am modifying/adding.

Which change are you proposing?

• Suggesting edits to an existing topic or collection
• Curating a new topic or collection
• Something that does not neatly fit into the binary options above

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Editing an existing topic or collection

I'm suggesting these edits to an existing topic or collection:

• Image (and my file is *.png, square, dimensions 288x288, size <= 75 kB)
• Content (and my changes are in index.md)

I created Pixel-art app which can be on this list.

[ahpook]

@Mateusz-Nejman thanks for the addition, but you have to append new items to the bottom of the list - please change this and we'll merge it!

[Mateusz-Nejman]

@Mateusz-Nejman thanks for the addition, but you have to append new items to the bottom of the list - please change this and we'll merge it!

Sure :) Changed