Add Capitalize in Beef (#3707)

archive/b/beef/Capitalize.bf

@@ -0,0 +1,30 @@
+using System;
+
+namespace Capitalize;
+
+class Program
+{
+    public static void Usage()
+    {
+        Console.WriteLine("Usage: please provide a string");
+        Environment.Exit(0);
+    }
+
+    public static void Capitalize(StringView str, ref String capitalized)
+    {
+        capitalized.Set(scope $"{str[0].ToUpper}{str[1...]}");
+    }
+
+    public static int Main(String[] args)
+    {
+        if (args.Count < 1 || args[0].Length == 0)
+        {
+            Usage();
+        }
+
+        String capitalized = scope .();
+        Capitalize(args[0], ref capitalized);
+        Console.WriteLine(capitalized);
+        return 0;
+    }
+}