[examples] Added core_directory_files (#5230)

* ADDED: example: `core_directory_files`

* Follow raylib's conventions

* Rework `core_directory_files` example

* Removed alternating colors & text on directory

* Update screenshot

---------

Co-authored-by: Ray <raysan5@gmail.com>

examples/core/core_directory_files.c

@@ -0,0 +1,94 @@
+/*******************************************************************************************
+*
+*   raylib [core] example - directory files
+*
+*   Example complexity rating: [★☆☆☆] 1/4
+*
+*   Example originally created with raylib 5.5, last time updated with raylib 5.6
+*
+*   Example contributed by Hugo ARNAL (@hugoarnal) and reviewed by Ramon Santamaria (@raysan5)
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2025 Hugo ARNAL (@hugoarnal)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+#include <string.h>         // Required for: strcpy()
+
+#define MAX_FILEPATH_SIZE       2048
+
+#define RAYGUI_IMPLEMENTATION
+#include "../shapes/raygui.h"                 // Required for GUI controls
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [core] example - directory files");
+
+    char directory[MAX_FILEPATH_SIZE] = { 0 };
+    strcpy(directory, GetWorkingDirectory());
+    FilePathList files = LoadDirectoryFiles(directory);
+
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+            ClearBackground(RAYWHITE);
+
+            DrawText(directory, 100, 40, 20, DARKGRAY);
+
+            if (GuiButton((Rectangle){40.0f, 40.0f, 20, 20}, "<"))
+            {
+                strcpy(directory, GetPrevDirectoryPath(directory));
+                UnloadDirectoryFiles(files);
+                files = LoadDirectoryFiles(directory);
+            }
+
+            for (int i = 0; i < (int)files.count; i++)
+            {
+                Color color = Fade(LIGHTGRAY, 0.3f);
+
+                if (!IsPathFile(files.paths[i]))
+                {
+                    if (GuiButton((Rectangle){0.0f, 85.0f + 40.0f*(float)i, screenWidth, 40}, ""))
+                    {
+                        strcpy(directory, files.paths[i]);
+                        UnloadDirectoryFiles(files);
+                        files = LoadDirectoryFiles(directory);
+                    }
+                }
+                DrawRectangle(0, 85 + 40*i, screenWidth, 40, color);
+
+                DrawText(GetFileName(files.paths[i]), 120, 100 + 40*i, 10, GRAY);
+            }
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadDirectoryFiles(files);
+
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}