Create README.md

Add some basic instruction about document compilation

Author: Polpetta

README.md

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+# TOSNotes
+LaTeX notes (in italian) about 'Tecnologie Open Source' course
+
+<h2>Compilation</h2>
+
+Install `latexmk` in your machine, open a terminal in the root of the project and run:
+```sh
+latexmk
+```