Add HexToBin usage example for SplashKit utilities

public/usage-examples/utilities/hex_to_bin-1-example-oop.cs

@@ -0,0 +1,13 @@
+using SplashKitSDK;
+
+public class Program
+{
+    public static void Main()
+    {
+        string hexValue = "1F3A";
+        string binaryValue = SplashKit.HexToBin(hexValue);  // SplashKit function
+
+        SplashKit.WriteLine("Hex: " + hexValue);
+        SplashKit.WriteLine("Binary: " + binaryValue);
+    }
+}

public/usage-examples/utilities/hex_to_bin-1-example-top-level.cs

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+using SplashKitSDK;
+
+string hexValue = "1F3A";
+string binaryValue = SplashKit.HexToBin(hexValue);  // SplashKit function
+
+SplashKit.WriteLine("Hex: " + hexValue);
+SplashKit.WriteLine("Binary: " + binaryValue);

public/usage-examples/utilities/hex_to_bin-1-example.cpp

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+#include "splashkit.h"
+
+int main()
+{
+    string hex_value = "1F3A";
+    string binary_value = hex_to_bin(hex_value); // SplashKit function
+
+    write_line("Hex: " + hex_value);
+    write_line("Binary: " + binary_value);
+
+    return 0;
+}
+

public/usage-examples/utilities/hex_to_bin-1-example.py

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+from splashkit import write_line, hex_to_bin
+
+hex_value = "1F3A"
+binary_value = hex_to_bin(hex_value)  # SplashKit function
+
+write_line("Hex: " + hex_value)
+write_line("Binary: " + binary_value)

public/usage-examples/utilities/hex_to_bin-1-example.txt

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+This example demonstrates how to convert a hexadecimal string into a binary string
+using SplashKit's built-in hex_to_bin / HexToBin function in Python, C++, and C#.