refactor: restructure the project

languages/c/Makefile

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+raylib_c: main.c
+	gcc main.c -Wall -Wextra -Werror -pedantic -o raylib_c -I../raylib-5.5_linux_amd64/include -L../raylib-5.5_linux_amd64/lib -l:libraylib.a -lm

languages/c/README.md

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+# Raylib in C
+
+## Quick start
+
+```sh
+$ make
+$ ./raylib_c
+```

languages/c/main.c

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+#include <stdio.h>
+#include <time.h>
+#include <raylib.h>
+
+#define WINDOW_WIDTH 800
+#define WINDOW_HEIGHT 600
+#define LOGO_HEIGHT 64
+#define LOGO_SPEED 300
+
+int main()
+{
+    InitWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Raylib in C");
+    SetTargetFPS(60);
+    SetRandomSeed(time(NULL));
+
+    Image logo_image = LoadImage("./c_logo.png");
+    ImageResize(&logo_image, logo_image.width * LOGO_HEIGHT / logo_image.height, LOGO_HEIGHT);
+    Texture2D logo_texture = LoadTextureFromImage(logo_image);
+    UnloadImage(logo_image);
+
+    float x = GetRandomValue(0, WINDOW_WIDTH - logo_texture.width);
+    float y = GetRandomValue(0, WINDOW_HEIGHT - logo_texture.height);
+
+    float dx = LOGO_SPEED * (GetRandomValue(0, 1) ? -1 : 1);
+    float dy = LOGO_SPEED * (GetRandomValue(0, 1) ? -1 : 1);
+
+    while (!WindowShouldClose())
+    {
+        float delta_time = GetFrameTime();
+
+        x += dx * delta_time;
+        y += dy * delta_time;
+
+        if (x < 0 || (x + logo_texture.width) >= WINDOW_WIDTH - 1)
+        {
+            dx *= -1;
+            x += dx * delta_time;
+        }
+        if (y < 0 || (y + logo_texture.height) >= WINDOW_HEIGHT - 1)
+        {
+            dy *= -1;
+            y += dy * delta_time;
+        }
+
+        BeginDrawing();
+
+        ClearBackground(BLACK);
+        DrawTextureV(logo_texture, (Vector2){x, y}, WHITE);
+
+        EndDrawing();
+    }
+
+    UnloadTexture(logo_texture);
+    CloseWindow();
+
+    return 0;
+}