Add moving circle example demonstrating basic animation

examples/shapes/shapes_moving_circle.c

@@ -0,0 +1,70 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - moving circle
+*
+*   Example complexity rating: [★☆☆☆] 1/4
+*
+*   This example demonstrates basic animation by moving a circle horizontally.
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - moving circle");
+
+    float x = 100.0f;
+    float speed = 200.0f;
+
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        // Move circle based on frame time (smooth movement)
+        x += speed * GetFrameTime();
+
+        if (x > screenWidth - 50 || x < 50) speed *= -1;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+    	    // Title
+    	    DrawText("Moving Circle Example", 10, 10, 20, DARKGRAY);
+
+    	    // Subtitle
+    	    DrawText("Circle moves horizontally using frame time", 10, 40, 10, GRAY);
+
+    	    // FPS (separate, non-overlapping)
+            DrawFPS(10, 70);
+
+            // Circle (main visual focus)
+            DrawCircle((int)x, screenHeight/2, 50, BLUE);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}