Pixed - new pixelart tool

[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 want to share my tool with everyone.

[jmeridth]

🛑 Thank you for the contribution ❤️. Unfortunately, as per our contribution guidelines, we don't allow self promotion if you are a direct employee of a company creating the project, or the creator and sole maintainer of the project:

Avoid conflicts of interest. These should be of general community interest, not a marketing vehicle for a product or a personal project. If you are a direct employee of a company creating the project, or the creator and sole maintainer, it’s unlikely to be accepted.

We do this so that project get curated if there is enough support/activity in the community. Thank you!