[UnitaryPatterns] Workbook Solutions Complete

[jainvasu631]

Added Workbook_UnitaryPatterns and cross-linked it with UnitaryPatterns as discussed in Comment in Issue #208.

The Workbook Solutions for all Tasks from 1 to 15 have been done.
I didn't notice the solutions in ReferenceImplementation.qs hence I have implemented my own solutions for the most part. They are mostly similar to the ReferenceImplementations.
For Task 13 - Removed Encapsulated Functions since that was causing errors in the Kernel Cell
For Task 14 - The Solution is longer but I believe it is easier to comprehend that the reference solution.
For Task 15 - I have simplified the solution. The reference solution didn't take advantage of the fact that both indices are always consecutive.

All checks are now passing.

[tcNickolas]

Could you please unentangle this PR from the MultiQubitGates change in #375? Looks like you've branched this PR off that branch, and I'd prefer to review them separately, since they are independent changes.

[jainvasu631]

Apologies. I didnt realise those changes got entangled with this Branch. I have reset the file to MultiQubitGates.ipynb as it is on the latest commit in Microsoft/QuantumKatas

[tcNickolas]

I did a round of cleanup - it looks like a lot of changes but in fact it's mostly spelling, capitalization and phrasings. The larger changes are:

• I added an image for a decrement circuit (I think it's more descriptive than just saying "a cascade of gates")
• I removed applications of I gates - it's not necessary, and I'd rather not teach the learner to apply identity when it's not necessary, this causes all kinds of weird code patterns later :-)
• In task 15 T_N(i) can be formatted a lot neater using \ddots command, and I think there were typos in spelling out T_2(1) and T_2(2) - the rows of 2x2 blocks were shifted by one element.

Looks great, and it's a very serious amount of work - it took me a a fair amount of time to go though it all (admittedly, mostly because I'm not very familiar with the last couple of tasks).

Thank you!

[tcNickolas]

Looking at your initial comment, what do you mean by "Encapsulated Functions" and what kinds of errors were they causing?

[jainvasu631]

While writing solutions for Task 13, I used the helper operation Decrement to refactor some code. However, since this name was used in Reference Implementation.qs I kept getting errors. Finally I decided to not refactor the code and instead wrote the entire function in main body only. Hence I was probably referring to the fact that operations in ReferenceImplementation.qs cause namespace conflicts.