refactor for common usage

README.md

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+<header>
+  <h1>Yggdrasil</h1>
+</header>
+Yggdrasil is a collections of notes around IT, OT and other geeks stuff
+<br>
+<br>
+<br>
+
+# [Bachelor in embedded system](/infotro/)
+Here notes I take during my bachelor in embedded systems
+
+Mainly some topics:
+- [PTR - Programmation Temps Réel](/infotro/PTR/)
+- [SDi - Système Distribué](/infotro/SDi/)
+- [Eln - Électronique](/infotro/Eln/)
+- [SEm - Systèmes Embarqué](/infotro/SEm/)
+
+# [STM32](/STM32/)
+Here some note specific about STM32