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feat: add csharp solution to lc problem: No.0020 (doocs#1931)

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	`1`	`+public class Solution {`
	`2`	`+ public bool IsValid(string s) {`
	`3`	`+ Stack<char> stk = new Stack<char>();`
	`4`	`+ foreach (var c in s.ToCharArray()) {`
	`5`	`+ if (c == '(') {`
	`6`	`+ stk.Push(')');`
	`7`	`+ } else if (c == '[') {`
	`8`	`+ stk.Push(']');`
	`9`	`+ } else if (c == '{') {`
	`10`	`+ stk.Push('}');`
	`11`	`+ } else if (stk.Count == 0 \|\| stk.Pop() != c) {`
	`12`	`+ return false;`
	`13`	`+ }`
	`14`	`+ }`
	`15`	`+ return stk.Count == 0;`
	`16`	`+ }`
	`17`	`+}`

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