Added base VGA Colour and Size.

kernel.nim

@@ -0,0 +1,28 @@
+type
+  VGA_Colour {.pure.} = enum
+    black = 0,
+    blue = 1,
+    green = 2,
+    cyan = 3,
+    red = 4,
+    magenta = 5,
+    brown = 6,
+    lightGrey = 7,
+    darkGrey = 8,
+    lightBlue = 9,
+    lightGreen = 10,
+    lightCyan = 11,
+    lightRed = 12,
+    lightMagenta = 13,
+    lightBrown = 14,
+    white = 15
+
+proc vga_entry_colour(fg: VGA_Colour, bg: VGA_Colour): uint8 =
+  result = uint8(ord(fg) or (ord(bg) shl 4))
+
+proc vga_entry(c: char, colour: uint8): uint16 =
+  result = uint8(c) or (colour shl 8)
+
+const
+  vgaWidth = 80
+  vgaHeight = 25