add(Scrollable): init function with corresponding usages

src/color.zig

@@ -20,6 +20,8 @@ pub const Color = enum(u8) {
     white,
     // TODO add further colors as described in https://gist.github.com/ConnerWill/d4b6c776b509add763e17f9f113fd25b # Color / Graphics Mode - 256 Colors
 
+    // TODO might be useful to use the std.ascii stuff!
+
     pub inline fn write(this: Color, writer: anytype, comptime coloring: enum { fg, bg, ul }) !void {
         if (this == .default) {
             switch (coloring) {