Commit 8fe78a3

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docs: update README_EN and README to lc problem: No.0020 (#1930)

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Original file line number	Diff line number	Diff line change
`@@ -252,6 +252,28 @@ impl Solution {`
`252`	`252`	`}`
`253`	`253`	```
`254`	`254`
	`255`	`+### C#`
	`256`	`+`
	`257`	+```cs
	`258`	`+public class Solution {`
	`259`	`+ public bool IsValid(string s) {`
	`260`	`+ Stack<char> stk = new Stack<char>();`
	`261`	`+ foreach (var c in s.ToCharArray()) {`
	`262`	`+ if (c == '(') {`
	`263`	`+ stk.Push(')');`
	`264`	`+ } else if (c == '[') {`
	`265`	`+ stk.Push(']');`
	`266`	`+ } else if (c == '{') {`
	`267`	`+ stk.Push('}');`
	`268`	`+ } else if (stk.Count == 0 \|\| stk.Pop() != c) {`
	`269`	`+ return false;`
	`270`	`+ }`
	`271`	`+ }`
	`272`	`+ return stk.Count == 0;`
	`273`	`+ }`
	`274`	`+}`
	`275`	+```
	`276`	`+`
`255`	`277`	`### ...`
`256`	`278`
`257`	`279`	```

Lines changed: 22 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -230,6 +230,28 @@ impl Solution {`
`230`	`230`	`}`
`231`	`231`	```
`232`	`232`
	`233`	`+### C#`
	`234`	`+`
	`235`	+```cs
	`236`	`+public class Solution {`
	`237`	`+ public bool IsValid(string s) {`
	`238`	`+ Stack<char> stk = new Stack<char>();`
	`239`	`+ foreach (var c in s.ToCharArray()) {`
	`240`	`+ if (c == '(') {`
	`241`	`+ stk.Push(')');`
	`242`	`+ } else if (c == '[') {`
	`243`	`+ stk.Push(']');`
	`244`	`+ } else if (c == '{') {`
	`245`	`+ stk.Push('}');`
	`246`	`+ } else if (stk.Count == 0 \|\| stk.Pop() != c) {`
	`247`	`+ return false;`
	`248`	`+ }`
	`249`	`+ }`
	`250`	`+ return stk.Count == 0;`
	`251`	`+ }`
	`252`	`+}`
	`253`	+```
	`254`	`+`
`233`	`255`	`### ...`
`234`	`256`
`235`	`257`	```

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