Prepare primary documentation

[gizmecano]

Primary documentation have to be added in the .github folder and available in both English and French.

• [x] Overview / Introduction (88e625b8b28a1e2390fbffdc3d765a421d90bed2)
  • [x] Background / Contextes (e945d7ee223f4c4f4e54eeec0a464d48d53732ed)
  • [x] Principles / Principes (554afc64e14336eec69e85ff1aceb735bba536fe)
  • [x] Variants / Variants (804ebbd340dc6eba0ea4943e45b7970556daf595)
• [x] Installation / Installation (336bab0253e001f07ea59af40e78a345c53113c5)
• [x] Workflow / flux de travaux
  • [x] Versioning / Versionnage (ed829eb05ea9898eec5b1005f8e41a75c068ae8e)
  • [x] Contributions / Contributions (9a218e31b812d2cd5caa07da21f9ee18b6eedfee)
• [x] Imprint / Impressum
  • [x] License / Licence (0fcb7e873e5209c90290aad06481debee8430a66)
  • [x] Credits / Crédits (3682dfb25d5df83a4874114432c23ffc8e84eaf3)