Added PPM writer

app/main.cpp

@@ -1,6 +1,27 @@
+#include "PpmImage.hpp"
+#include <cstdint>
 #include <print>
+#include <vector>
 
 int main(int argc, char **argv) {
   std::println("Hello, GraphicsSandbox!");
+
+  // Generate PPM image
+  constexpr size_t imageWidth = 256;
+  constexpr size_t imageHeight = 256;
+  std::vector<std::vector<std::uint8_t>> imageData;
+  imageData.resize(imageWidth);
+  for (auto &row : imageData) {
+    row.resize(imageHeight);
+  }
+
+  image_writers::PpmImage ppmImage(imageData);
+
+  if (ppmImage.writeToFile("Image.ppm")) {
+    std::println("Wrote PPM image");
+  } else {
+    std::println("Failed to write PPM image");
+  }
+
   return 0;
 }