Add todo.

Author: munificent

note/todo.txt

@@ -0,0 +1,12 @@
+- write observer chapter
+- write message queue chapter
+- write bytecode chapter
+- decide about cutting context parameter
+- reorganize patterns into sections if context parameter is cut
+- write intro for behaving patterns section
+- write intro for communicating patterns section
+- write intro for optimizing patterns section
+- write "games, architecture, and performance" intro chapter
+- redo object pool fragmentation illustration
+- redo double buffer tearing illustration
+- decide style guide questions and then apply style guide to everything