Add qoi image format

Author: marcauberer

README.md

@@ -38,4 +38,7 @@ There are a variety of different algorithms in this repository. To keep an overv
 ### Network encoding algorithms
 * [Hemming Code (Python / PHP)](https://github.com/marcauberer/algorithm-collection/tree/master/HemmingCode)
 
+### Compression algorithms
+* [QOI Image Format](https://qoiformat.org/)
+
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