docs: simple readme

README.md

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+# Developer tools
+
+My personal set of tools to ease and speed up my development experience.
+
+1. `colorizer`: color model converter.

colorizer/README.md

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+# Colorizer
+
+Simple CLI color parser. Reads the color to be parsed either from the clipboard, from and input argument or directly from the user keyboard manual input.
+
+## Arguments
+
+The program allows one of these 2 arguments:
+
+- `--clipboard` / `-c` : read from clipboard first
+- `--input <String>` / `-i <String>` : dont read from clipboard nor input, simply try parsing the input