Add files via upload

extras/cpp/demo.cpp

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+// extras/cpp/demo.cpp — decorative, not part of the build. compile with:
+//   cl.exe /std:c++17 /EHsc demo.cpp /Fe:demo.exe
+// or: g++ -std=c++17 demo.cpp -o demo
+
+#include <iostream>
+#include "audio_meta.hpp"
+#include "progress_bar.hpp"
+#include "playlist.hpp"
+
+int main() {
+    using nexdex::AudioTagBuilder;
+    using nexdex::ProgressBar;
+    using nexdex::Playlist;
+    using nexdex::Track;
+
+    auto tag = AudioTagBuilder("MATADORA (Extended)", "SUKA.")
+                   .year(2026)
+                   .build();
+
+    std::cout << tag.describe() << "\n\n";
+
+    ProgressBar bar("MATADORA (Extended)", 30);
+    for (int pct = 0; pct <= 100; pct += 20) {
+        std::cout << bar.render(pct) << "\n";
+    }
+
+    Playlist playlist;
+    playlist.add(Track{tag, "downloads/MATADORA (Extended).flac", 222});
+    std::cout << "\nplaylist: " << playlist.size() << " track(s), total "
+              << Playlist::formatDuration(playlist.totalDurationSecs()) << "\n";
+
+    std::cout << "\nmade by savsis with <3\n";
+    return 0;
+}