Added C language demo to the 'reading-and-writing-graphics' example

[0x5247]

Firstly, I would like to tell you that this wasm-by-example project really helped me in solidifying my knowledge of WebAssembly.

In an effort to contribute back to this project, I’ve added a example for the C language in the ‘reading-and-writing-graphics’ section.

In this example, I’ve tried to keep the index.js file consistent with the one in the AssemblyScript example. While there might be room for simplification and improvement, I believe maintaining consistency across examples would be better.

Also the booleans to check if the current square is dark or light can be brought down this single condition (x % 2 == y % 2). I didn't do that in order to stay consistent.

Please note that this example does not use Emscripten.

I hope this contribution is useful. If it is, I’d be more than happy to continue doing more contributions.

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