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Add README_EN.md for 0202.Happy Number

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	`1`	`+# Happy Number`
	`2`	`+`
	`3`	`+Write an algorithm to determine if a number is "happy".`
	`4`	`+`
	`5`	`+A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers.`
	`6`	`+`
	`7`	`+## Example :`
	`8`	+```
	`9`	`+ Input: 19`
	`10`	`+ Output: true`
	`11`	`+ Explanation:`
	`12`	`+ 12 + 92 = 82`
	`13`	`+ 82 + 22 = 68`
	`14`	`+ 62 + 82 = 100`
	`15`	`+ 12 + 02 + 02 = 1`
	`16`	+```

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