Add code block in README

README.md

@@ -1,7 +1,8 @@
 # recipe_gentoo
 
-Check system configuration for a gentoo machine (VM or PHYSICAL) based on GRIFON's architecture.
-It's a Gentoo OS configuration recipe. This script normally doesn't modify anything on the system.
+Check system configuration for a Gentoo machine (VM or PHYSICAL) based on GRIFON's architecture.  
+It's a Gentoo OS configuration recipe.  
+his script normally doesn't modify anything on the system.  
 
 To use (with root user) :   
 ```
@@ -10,7 +11,10 @@ vim  ./vars.sh # Edit all values which will be used by the script
 ./recipe_gentoo.sh [--physical]  
 ```
 
-If you cannot execute the script, add the 'x' permission for the user (chmod u+x ./recipe_gentoo.sh).
+If you cannot execute the script, add the 'x' permission for the user  chmod u+x 
+```
+./recipe_gentoo.sh
+```
 
 Not finished, in progress....
 
@@ -18,7 +22,7 @@ TO DO :
 - Test the recipe check auto-backup (OK, not fully tested)
 - Others (script design, documentation...)
  
-Checked point :
+Checked points :
 - User is root to run the script
 - Check requirements
 - Installed packages