update Readme.md

README.md

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-Ascii art paint
-======
+# Ascii art paint
+
 Ascii art created in pure Javascript (and a little bit of HTML/CSS)
 
 [take a look here](https://legonzaur.github.io/Ascii/)
 
-
-Controls
-------
+## Controls
 
 **Any keyboard key** : change chracter
 
 **Lbutton :** draw
 
-**SHIFT + Lclick :** draw Line 
+**SHIFT + Lclick :** draw Line
 
 **CTRL + Lclick :** fill (does not checks diagonals)
 
 **CTRL + Z :** Go back
 
 **CTRL + Y :** Go Forth (only available if you gone back)
+
+**CTRL + S :** Save current image into a reusable txt file
+
+**CTRL + O :** Open previously saved image