Update README.md
tasks list added
tasks list added
logic in sorting tasks corrected
Updated formatting

Eclipse wants stuff formatted this way. Note, there are various
formatting changes that I don't agree with, but from what I saw, this
was better than what we had. Furthermore, we should agree on a coding
style and update the Eclipse formatter for Java accordingly (under
Preferences). Then the formatter will actually work properly for us.
refactored, updated formatting and layout of categories view
capitalize text fields, further layout changes