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feat(problem #83): add concatenation-of-array

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	`1`	`+public class Solution`
	`2`	`+{`
	`3`	`+ #region Approach 1 (Using Array)`
	`4`	`+ public static int[] GetConcatenation(int[] nums)`
	`5`	`+ {`
	`6`	`+ if (nums == null \|\| nums.Length == 0)`
	`7`	`+ {`
	`8`	`+ return [];`
	`9`	`+ }`
	`10`	`+`
	`11`	`+ int[] result = new int[2 * nums.Length];`
	`12`	`+`
	`13`	`+ for (int i = 0; i < nums.Length; i++)`
	`14`	`+ {`
	`15`	`+ result[i + nums.Length] = result[i] = nums[i];`
	`16`	`+ }`
	`17`	`+`
	`18`	`+ return result;`
	`19`	`+ }`
	`20`	`+ #endregion`
	`21`	`+`
	`22`	`+ #region Approach 2 (Using List)`
	`23`	`+ public static int[] GetConcatenation2(int[] nums)`
	`24`	`+ {`
	`25`	`+ if (nums == null \|\| nums.Length == 0)`
	`26`	`+ {`
	`27`	`+ return [];`
	`28`	`+ }`
	`29`	`+`
	`30`	`+ List<int> result = new List<int>(nums);`
	`31`	`+`
	`32`	`+ foreach (int num in nums)`
	`33`	`+ {`
	`34`	`+ result.Add(num);`
	`35`	`+ }`
	`36`	`+`
	`37`	`+ return result.ToArray();`
	`38`	`+ }`
	`39`	`+ #endregion`
	`40`	`+`
	`41`	`+ private static void Main()`
	`42`	`+ {`
	`43`	`+ int[] nums = [1, 2, 1];`
	`44`	`+ int[] result = GetConcatenation(nums);`
	`45`	`+`
	`46`	`+ Console.WriteLine(string.Join(", ", result));`
	`47`	`+ }`
	`48`	`+}`

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