Update workflow and mid-term review notes.
Added some reference materials that would help better understand the
core of "sustainable economy".
TODO: Finish the homework in the morning with less than 2 hours. After
that, start "viewing and reviewing, with Notes." As well as programming
for a better future.
Update homework working process.
Added a few "what do you think of Abu Dhabi" series, aka, the 3rd
question and its answer.
The second part of question 2 is still missing. Though I feel my
calculation is 100% correct.

TODO: Finish the last part of question 3. And making up your missing
homework series as soon as possible, which is what Dr. Sid told ya a
long long time, ago.
Merge branch 'master' of github.com:ProfessorX/UCC501