Add missing config keys to documentation. Fixes #47

CONFIG.md

@@ -22,9 +22,13 @@ Some *local assignments* are shared between entries using any *protocol*, while
 *Globally assignable* keys are:
 * `TIMEOUT` - Specifies the timeout in seconds before the first *entry* is automatically booted.
 * `DEFAULT_ENTRY` - 0-based entry index of the entry which will be automatically selected at startup. If unspecified, it is `0`.
-* `GRAPHICS` - If set to `yes`, do use graphical VESA framebuffer for the boot menu.
-* `THEME_BLACK`, `THEME_RED`, `THEME_GREEN`, `THEME_BROWN`, `THEME_BLUE`, `THEME_MAGENTA`, `THEME_CYAN`, `THEME_GREY`, `THEME_WHITE` - Specifies the colors used by the terminal (RRGGBB). Ignored if `GRAPHICS` is not `yes`.
+* `GRAPHICS` - If set to `yes`, do use graphical VESA framebuffer for the boot menu, else use text mode.
+* `THEME_BLACK`, `THEME_RED`, `THEME_GREEN`, `THEME_BROWN`, `THEME_BLUE`, `THEME_MAGENTA`, `THEME_CYAN`, `THEME_GREY` - Specifies the colors used by the terminal (RRGGBB). Ignored if `GRAPHICS` is not `yes`.
 * `THEME_MARGIN` - Set the amount of margin around the terminal. Ignored if `GRAPHICS` is not `yes`.
+* `THEME_MARGIN_GRADIENT` - Set the thickness in pixel for the gradient around the terminal. Ignored if `GRAPHICS` is not `yes`.
+* `BACKGROUND_DRIVE` - Drive where to find the background .BMP file. Assume boot drive if unspecified. Ignored if `GRAPHICS` is not `yes`.
+* `BACKGROUND_PARTITION` - Partition where to find the background .BMP file. Ignored if `GRAPHICS` is not `yes`.
+* `BACKGROUND_PATH` - Path where to find the background .BMP file. Ignored if `GRAPHICS` is not `yes`.
 
 *Locally assignable (non protocol specific)* keys are:
 * `PROTOCOL` - The boot protocol that will be used to boot the kernel. Valid protocols are: `linux`, `stivale`, `stivale2`, `chainload`.