Add Base64 Encode usage example for SplashKit utilities

public/usage-examples/utilities/base64_encode-1-example-oop.cs

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+using System;
+using SplashKitSDK;
+
+public class BaseEncode
+{
+    public static void Main()
+    {
+        string text = "Hello SplashKit";
+
+        // Encode a plain string into Base64
+        string encoded = SplashKit.Base64Encode(text);
+
+        // Display the original and encoded values
+        SplashKit.WriteLine("Original: " + text);
+        SplashKit.WriteLine("Base64: " + encoded);
+    }
+}

public/usage-examples/utilities/base64_encode-1-example-top-level.cs

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+using SplashKitSDK;
+
+string text = "Hello SplashKit";
+
+// Encode a plain string into Base64
+string encoded = SplashKit.Base64Encode(text);
+
+// Display the original and encoded values
+SplashKit.WriteLine("Original: " + text);
+SplashKit.WriteLine("Base64: " + encoded);

public/usage-examples/utilities/base64_encode-1-example.cpp

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+#include "splashkit.h"
+
+int main()
+{
+    string text = "Hello SplashKit";
+
+    // Encode a plain string into Base64
+    string encoded = base64_encode(text);
+
+    // Display the original and encoded values
+    write_line("Original: " + text);
+    write_line("Base64: " + encoded);
+
+    return 0;
+}

public/usage-examples/utilities/base64_encode-1-example.py

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+from splashkit import *
+
+text = "Hello SplashKit"
+
+# Encode a plain string into Base64
+encoded = base64_encode(text)
+
+# Print the original and encoded values
+write_line("Original: " + text)
+write_line("Base64: " + encoded)

public/usage-examples/utilities/base64_encode-1-example.txt

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+Function: base64_encode
+Category: Utilities
+Purpose: Demonstrates how to encode a plain string ("Hello SplashKit") into Base64 using SplashKit.
+Languages: C++, Python, C# (OOP), C# (Top-level)
+
+Expected Output:
+Original: Hello SplashKit
+Base64: SGVsbG8gU3BsYXNoS2l0