Add command section

Guides/vim.md

@@ -1,7 +1,9 @@
 # Vim
 Jovian cheat sheet for vim
 
-## Bookmark
+## Commands
+
+### Bookmark
 `mx` to bookmark with letter _x_
 
 ``` 
@@ -9,7 +11,7 @@ Jovian cheat sheet for vim
 ``` 
 to go to _x_
 
-## Case
+### Case
 `gu` and movement to lowercase
 
 `gU` and movement to uppercase