Added some C# snippets

snippets/csharp/list-utilities/swap-items-at-index.md

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+---
+title: Swap two items at determined indexes
+description: Swaps two items at determined indexes
+author: omegaleo
+tags: csharp,c#,list,utility
+---
+
+```csharp
+/// <summary>
+/// Swaps the position of 2 elements inside of a List
+/// </summary>
+/// <returns>List with swapped elements</returns>
+public static IList<T> Swap<T>(this IList<T> list, int indexA, int indexB)
+{
+    (list[indexA], list[indexB]) = (list[indexB], list[indexA]);
+    return list;
+}
+
+var list = new List<string>() {"Test", "Test2"};
+
+Console.WriteLine(list[0]); // Outputs: Test
+Console.WriteLine(list[1]); // Outputs: Test2
+
+list = list.Swap(0, 1).ToList();
+
+Console.WriteLine(list[0]); // Outputs: Test2
+Console.WriteLine(list[1]); // Outputs: Test
+```

snippets/csharp/string-utilities/truncate-string.md

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+---
+title: Truncate a String
+description: Cut off a string once it reaches a determined amount of characters and add '...' to the end of the string
+author: omegaleo
+tags: csharp,c#,list,utility
+---
+
+```csharp
+/// <summary>
+/// Cut off a string once it reaches a <paramref name="maxChars"/> amount of characters and add '...' to the end of the string
+/// </summary>
+public static string Truncate(this string value, int maxChars)
+{
+    return value.Length <= maxChars ? value : value.Substring(0, maxChars) + "...";
+}
+
+var str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam tristique rhoncus bibendum. Vivamus laoreet tortor vel neque lacinia, nec rhoncus ligula pellentesque. Nullam eu ornare nibh. Donec tincidunt viverra nulla.";
+
+Console.WriteLine(str); // Outputs the full string
+Console.WriteLine(str.Truncate(5)); // Outputs Lorem...
+```