Add mouse_movement usage example

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

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+using SplashKitSDK;
+
+namespace MouseMovementExample
+{
+    public static class Program
+    {
+        public static void Main()
+        {
+            SplashKit.OpenWindow("Mouse Movement Display", 800, 600);
+
+            double circleX = 400;
+            double circleY = 300;
+
+            while (!SplashKit.QuitRequested())
+            {
+                SplashKit.ProcessEvents();
+
+                Vector2D movement = SplashKit.MouseMovement();
+
+                circleX += movement.X;
+                circleY += movement.Y;
+
+                SplashKit.ClearScreen(Color.White);
+
+                SplashKit.DrawText("Move the mouse to see mouse_movement() values.", Color.Black, 20, 20);
+                SplashKit.DrawText("Movement X: " + movement.X, Color.Black, 20, 60);
+                SplashKit.DrawText("Movement Y: " + movement.Y, Color.Black, 20, 100);
+
+                SplashKit.FillCircle(Color.Blue, circleX, circleY, 15);
+                SplashKit.DrawCircle(Color.Black, circleX, circleY, 15);
+
+                SplashKit.DrawLine(Color.Red, circleX, circleY, circleX + movement.X * 5, circleY + movement.Y * 5);
+
+                SplashKit.RefreshScreen(60);
+            }
+
+            SplashKit.CloseAllWindows();
+        }
+    }
+}

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

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+using SplashKitSDK;
+using static SplashKitSDK.SplashKit;
+
+OpenWindow("Mouse Movement Display", 800, 600);
+
+double circleX = 400;
+double circleY = 300;
+
+while (!QuitRequested())
+{
+    ProcessEvents();
+
+    Vector2D movement = MouseMovement();
+
+    circleX += movement.X;
+    circleY += movement.Y;
+
+    ClearScreen(ColorWhite());
+
+    DrawText("Move the mouse to see mouse_movement() values.", ColorBlack(), 20, 20);
+    DrawText("Movement X: " + movement.X, ColorBlack(), 20, 60);
+    DrawText("Movement Y: " + movement.Y, ColorBlack(), 20, 100);
+
+    FillCircle(ColorBlue(), circleX, circleY, 15);
+    DrawCircle(ColorBlack(), circleX, circleY, 15);
+
+    DrawLine(ColorRed(), circleX, circleY, circleX + movement.X * 5, circleY + movement.Y * 5);
+
+    RefreshScreen(60);
+}
+
+CloseAllWindows();

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

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+#include "splashkit.h"
+#include <string>
+
+int main()
+{
+    open_window("Mouse Movement Display", 800, 600);
+
+    double circle_x = 400;
+    double circle_y = 300;
+
+    while (!quit_requested())
+    {
+        process_events();
+
+        vector_2d movement = mouse_movement();
+
+        circle_x += movement.x;
+        circle_y += movement.y;
+
+        clear_screen(COLOR_WHITE);
+
+        draw_text("Move the mouse to see mouse_movement() values.", COLOR_BLACK, 20, 20);
+        draw_text(std::string("Movement X: ") + std::to_string(movement.x), COLOR_BLACK, 20, 60);
+        draw_text(std::string("Movement Y: ") + std::to_string(movement.y), COLOR_BLACK, 20, 100);
+
+        fill_circle(COLOR_BLUE, circle_x, circle_y, 15);
+        draw_circle(COLOR_BLACK, circle_x, circle_y, 15);
+
+        draw_line(COLOR_RED, circle_x, circle_y, circle_x + movement.x * 5, circle_y + movement.y * 5);
+
+        refresh_screen(60);
+    }
+
+    close_all_windows();
+
+    return 0;
+}

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

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+from splashkit import *
+
+open_window("Mouse Movement Display", 800, 600)
+
+circle_x = 400
+circle_y = 300
+
+while not quit_requested():
+    process_events()
+
+    movement = mouse_movement()
+
+    circle_x += movement.x
+    circle_y += movement.y
+
+    clear_screen(color_white())
+
+    draw_text_no_font_no_size("Move the mouse to see mouse_movement() values.", color_black(), 20, 20)
+    draw_text_no_font_no_size("Movement X: " + str(movement.x), color_black(), 20, 60)
+    draw_text_no_font_no_size("Movement Y: " + str(movement.y), color_black(), 20, 100)
+
+    fill_circle(color_blue(), circle_x, circle_y, 15)
+    draw_circle(color_black(), circle_x, circle_y, 15)
+
+    draw_line(color_red(), circle_x, circle_y, circle_x + movement.x * 5, circle_y + movement.y * 5)
+
+    refresh_screen_with_target_fps(60)
+
+close_all_windows()

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

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+Tracking Mouse Movement in a Window