Begin work on rust versions of modules

lang_c/03_character_device/README.md

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+## Additionnal informations
+
+To test character device, your need create the device.
+
+Step 1: Get major number of your module device
+
+```bash
+cat /proc/devices | grep flodev
+```
+
+Step 2: Create device (as root)
+
+```bash
+mknod /dev/[wanted name] -c <major_number> 0
+```
+
+Exemple (as root):
+
+```bash
+cat /proc/devices | grep flodev # => 236 flodev
+mknod /dev/flodev0 c 236 0
+echo "Salut" >> /dev/flodev0
+dmesg | tail # =>
+#   flodev - Ouverture du périphérique
+#   flodev - Message reçu: Salut
+#   flodev - Fermeture du périphérique
+rm /dev/flodev0
+```
+
+
+