Created Update the WiKi (markdown)

Author: fpistm

Update-the-WiKi.md

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+This [WiKi] can't be edited publicly due to spam, advertising,...
+
+# To contribute:
+
+1. Duplicate the repository following this guide: 
+   https://docs.github.com/en/repositories/creating-and-managing-repositories/duplicating-a-repository
+2. Made you changes on your copy of the wiki in a dedicated branch.
+3. Commit them.
+4. Warn us you made an update with the link to your updated branch in the dedicated [GitHub discussion](https://github.com/orgs/stm32duino/discussions/categories/wiki).
+5. If changes accepted, it will be merged in this [WiKi].
+
+[WiKi]: https://github.com/stm32duino/Arduino_Core_STM32/wiki