Add a todo for default cube key

dev.org

@@ -37,6 +37,8 @@ On the first level, I should feel comfortable with it.
    or other maintenance jobs
 
 * Tasks
+
+** TODO Add a =:default= key to the cube indicating whether it should be enabled by default or not
 ** TODO Reformat the modeline
 ** TODO Create a macro similar to =with-ability= to run a block of code only if the given cube was active
 ** TODO Enable =straight= and =use-package= integration on compile time. Checout out =fpkg/core.el=