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Add 372_Perfectly-Balanced to DailyProgrammer

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	`1`	`+# ProbName - Notes`

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	`1`	`+# Challenge #372 [Easy]: Perfectly balanced`
	`2`	`+`
	`3`	`+Given a string containing only the characters x and y, find whether there are the same number of xs and ys.`
	`4`	`+`
	`5`	+```
	`6`	`+balanced("xxxyyy") => true`
	`7`	`+balanced("yyyxxx") => true`
	`8`	`+balanced("xxxyyyy") => false`
	`9`	`+balanced("yyxyxxyxxyyyyxxxyxyx") => true`
	`10`	`+balanced("xyxxxxyyyxyxxyxxyy") => false`
	`11`	`+balanced("") => true`
	`12`	`+balanced("x") => false`
	`13`	+```
	`14`	`+`
	`15`	`+### Optional bonus`
	`16`	`+`
	`17`	`+Given a string containing only lowercase letters, find whether every letter that appears in the string appears the same number of times. Don't forget to handle the empty string ("") correctly!`
	`18`	`+`
	`19`	+```
	`20`	`+balanced_bonus("xxxyyyzzz") => true`
	`21`	`+balanced_bonus("abccbaabccba") => true`
	`22`	`+balanced_bonus("xxxyyyzzzz") => false`
	`23`	`+balanced_bonus("abcdefghijklmnopqrstuvwxyz") => true`
	`24`	`+balanced_bonus("pqq") => false`
	`25`	`+balanced_bonus("fdedfdeffeddefeeeefddf") => false`
	`26`	`+balanced_bonus("www") => true`
	`27`	`+balanced_bonus("x") => true`
	`28`	`+balanced_bonus("") => true`
	`29`	+```
	`30`	`+`
	`31`	+Note that `balanced_bonus` behaves differently than balanced for a few inputs, e.g. `"x"`.

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