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add dictionary comprehension

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	`1`	`+# List Comprehension`
	`2`	`+This directory is here to show the Speed Difference between using`
	`3`	`+Dictionary Comprehension vs. a For Loop to create a dictionary`
	`4`	`+`
	`5`	`+## Executing`
	`6`	`+In a UNIX terminal, run:`
	`7`	`+`
	`8`	`+`
	`9`	+```
	`10`	`+time python dict-loop.py`
	`11`	`+`
	`12`	`+real 0m3.087s`
	`13`	`+user 0m2.762s`
	`14`	`+sys 0m0.324s`
	`15`	+```
	`16`	`+`
	`17`	+```
	`18`	`+time python dict-comp.py`
	`19`	`+`
	`20`	`+real 0m2.581s`
	`21`	`+user 0m2.252s`
	`22`	`+sys 0m0.328s`
	`23`	+```
	`24`	`+`
	`25`	`+`
	`26`	`+Here we see that the dictionary comprehension is about 20% faster`
	`27`	`+than the for loop method. Again, this is a case-by-case scenario,`
	`28`	`+but generally the Dictionary comprehension will probably be faster.`
	`29`	`+There are probably cases where dictionary comprehension is slower,`
	`30`	`+but at the end of the day, comprehensions are generally used for`
	`31`	`+more concise code rather than for speed.`

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	`1`	`+d = {i : i**2 for i in range(1, 10_000_001)}`

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