Update XTOS ideas

IDEAS.md

@@ -20,3 +20,6 @@ This is a list of ideas that migh but not must be realized.
        requirements, it should cause a kernel panic before any non-supported instruction is being used.
  - [ ] Design a mechanism of sharing common code between some architectures (i.e. both i686 and amd64 supports APIC,
        while it is not available on ARM).
+ - [ ] Finish framebuffer and terminal implementation. Initialization code is already prepared as well as routines for
+       clearing the screen and drawing single points. Terminal should be instantiable (should be able to create many
+       terminals and switch between them) and work on top of FB. It should define ANSI colors and scrollback buffer.