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feat: adds two sum in nim, minor fix in readme_en (doocs#497)

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`@@ -131,6 +131,24 @@ class Solution {`
`131`	`131`	`}`
`132`	`132`	```
`133`	`133`
	`134`	`+### Nim`
	`135`	`+`
	`136`	+```nim
	`137`	`+import std/enumerate`
	`138`	`+`
	`139`	`+proc twoSum(nums: seq[int], target: int): seq[int] =`
	`140`	`+ var`
	`141`	`+ bal: int`
	`142`	`+ tdx: int`
	`143`	`+ for idx, val in enumerate(nums):`
	`144`	`+ bal = target - val`
	`145`	`+ if bal in nums:`
	`146`	`+ tdx = nums.find(bal)`
	`147`	`+ if idx != tdx:`
	`148`	`+ return @[idx, tdx]`
	`149`	`+`
	`150`	+```
	`151`	`+`
`134`	`152`	`### ...`
`135`	`153`
`136`	`154`	```

Lines changed: 19 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -16,7 +16,7 @@`
`16`	`16`	`<pre>`
`17`	`17`	`<strong>Input:</strong> nums = [2,7,11,15], target = 9`
`18`	`18`	`<strong>Output:</strong> [0,1]`
`19`		`-<strong>Output:</strong> Because nums[0] + nums[1] == 9, we return [0, 1].`
	`19`	`+<strong>Explanation:</strong> Because nums[0] + nums[1] == 9, we return [0, 1].`
`20`	`20`	`</pre>`
`21`	`21`
`22`	`22`	`<p><strong>Example 2:</strong></p>`
`@@ -117,6 +117,24 @@ class Solution {`
`117`	`117`	`}`
`118`	`118`	```
`119`	`119`
	`120`	`+### Nim`
	`121`	`+`
	`122`	+```nim
	`123`	`+import std/enumerate`
	`124`	`+`
	`125`	`+proc twoSum(nums: seq[int], target: int): seq[int] =`
	`126`	`+ var`
	`127`	`+ bal: int`
	`128`	`+ tdx: int`
	`129`	`+ for idx, val in enumerate(nums):`
	`130`	`+ bal = target - val`
	`131`	`+ if bal in nums:`
	`132`	`+ tdx = nums.find(bal)`
	`133`	`+ if idx != tdx:`
	`134`	`+ return @[idx, tdx]`
	`135`	`+`
	`136`	+```
	`137`	`+`
`120`	`138`	`### ...`
`121`	`139`
`122`	`140`	```

Lines changed: 16 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,16 @@`
	`1`	`+#[`
	`2`	`+ Author: @joe733`
	`3`	`+]#`
	`4`	`+`
	`5`	`+import std/enumerate`
	`6`	`+`
	`7`	`+proc twoSum(nums: seq[int], target: int): seq[int] =`
	`8`	`+ var`
	`9`	`+ bal: int`
	`10`	`+ tdx: int`
	`11`	`+ for idx, val in enumerate(nums):`
	`12`	`+ bal = target - val`
	`13`	`+ if bal in nums:`
	`14`	`+ tdx = nums.find(bal)`
	`15`	`+ if idx != tdx:`
	`16`	`+ return @[idx, tdx]`

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