Add code

test.cpp

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+#include <iostream>
+#include <fstream>
+#include "steam/steam_api.h"
+#include <string>
+#include <cassert>
+#include <vector>
+#include <map>
+
+using namespace std;
+
+inline const char* const BoolToString(bool b)
+{
+  return b ? "true" : "false";
+}
+
+int main() {
+    SteamAPI_Init();
+    auto testdlc = 445630;
+    std::cout << "We have " << SteamApps()->GetDLCCount() << " DLCs. " << std::endl;
+    std::cout << BoolToString(SteamApps()->BIsDlcInstalled(testdlc)) << std::endl;
+    std::cout << SteamUser()->UserHasLicenseForApp(SteamUser()->GetSteamID(), testdlc) << std::endl;
+    return 0;
+}