Add mouse_clicked usage example

public/usage-examples/input/mouse_clicked-1-example-oop.cs

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+using System.Collections.Generic;
+using SplashKitSDK;
+
+namespace MouseClickedExample
+{
+    public class Program
+    {
+        public static void Main()
+        {
+            SplashKit.OpenWindow("Click to Place Markers", 800, 600);
+
+            List<Point2D> clicks = new();
+
+            while (!SplashKit.QuitRequested())
+            {
+                SplashKit.ProcessEvents();
+
+                // Add a marker where the left mouse button was clicked
+                if (SplashKit.MouseClicked(MouseButton.LeftButton))
+                {
+                    clicks.Add(SplashKit.MousePosition());
+                }
+
+                SplashKit.ClearScreen();
+
+                foreach (Point2D pt in clicks)
+                {
+                    SplashKit.FillCircle(Color.Red, pt.X, pt.Y, 8);
+                }
+
+                SplashKit.RefreshScreen(60);
+            }
+
+            SplashKit.CloseAllWindows();
+        }
+    }
+}

public/usage-examples/input/mouse_clicked-1-example-top-level.cs

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+using System.Collections.Generic;
+using SplashKitSDK;
+using static SplashKitSDK.SplashKit;
+
+OpenWindow("Click to Place Markers", 800, 600);
+
+List<Point2D> clicks = new();
+
+while (!QuitRequested())
+{
+    ProcessEvents();
+
+    // Add a marker where the left mouse button was clicked
+    if (MouseClicked(MouseButton.LeftButton))
+    {
+        clicks.Add(MousePosition());
+    }
+
+    ClearScreen(ColorWhite());
+
+    foreach (Point2D pt in clicks)
+    {
+        FillCircle(ColorRed(), pt.X, pt.Y, 8);
+    }
+
+    RefreshScreen(60);
+}
+
+CloseAllWindows();

public/usage-examples/input/mouse_clicked-1-example.cpp

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+#include "splashkit.h"
+#include <vector>
+
+int main()
+{
+    open_window("Click to Place Markers", 800, 600);
+
+    std::vector<point_2d> clicks;
+
+    while (!quit_requested())
+    {
+        process_events();
+
+        // Add a marker where the left mouse button was clicked
+        if (mouse_clicked(LEFT_BUTTON))
+        {
+            clicks.push_back(mouse_position());
+        }
+
+        clear_screen(color_white());
+
+        for (const point_2d &pt : clicks)
+        {
+            fill_circle(COLOR_RED, pt.x, pt.y, 8);
+        }
+
+        refresh_screen(60);
+    }
+
+    close_all_windows();
+    return 0;
+}

public/usage-examples/input/mouse_clicked-1-example.py

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+from splashkit import *
+
+open_window("Click to Place Markers", 800, 600)
+
+clicks = []
+
+while not quit_requested():
+    process_events()
+
+    # Add a marker where the left mouse button was clicked
+    if mouse_clicked(MouseButton.left_button):
+        clicks.append(mouse_position())
+
+    clear_screen(color_white())
+
+    for pt in clicks:
+        fill_circle(color_red(), pt.x, pt.y, 8)
+
+    refresh_screen()
+
+close_all_windows()

public/usage-examples/input/mouse_clicked-1-example.txt

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+Click to Place Markers
+
+Left click anywhere in the window to place a red marker at the clicked position.