Created todo documentation.

doc/todo.rst

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+Current
+=======
+- Add UI for note-taking
+
+Upcoming
+========
+- Generate day seperators
+- Fix UI for tasks with a duration a day or longer
+- Fix hover UI for user menu
+- Fix hover UI for timeline menu
+- Test (implement?) timeline selection
+- Add UI for timeline creation
+- Change the UI for editing the start-time. Use a date-picker (custom jQuery
+  UI theme?)
+- Fix UI for timestamp edits which change the order of events in the timeline.
+- Create a light, alternating background for entries
+- Add hover-enabled icons for editing entries/showing notes
+- Create tooltips.
+
+Done
+====