added discord game sdk

src/discord-game-sdk-cpp/application_manager.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "types.h"
+
+namespace discord {
+
+class ApplicationManager final {
+public:
+    ~ApplicationManager() = default;
+
+    void ValidateOrExit(std::function<void(Result)> callback);
+    void GetCurrentLocale(char locale[128]);
+    void GetCurrentBranch(char branch[4096]);
+    void GetOAuth2Token(std::function<void(Result, OAuth2Token const&)> callback);
+    void GetTicket(std::function<void(Result, char const*)> callback);
+
+private:
+    friend class Core;
+
+    ApplicationManager() = default;
+    ApplicationManager(ApplicationManager const& rhs) = delete;
+    ApplicationManager& operator=(ApplicationManager const& rhs) = delete;
+    ApplicationManager(ApplicationManager&& rhs) = delete;
+    ApplicationManager& operator=(ApplicationManager&& rhs) = delete;
+
+    IDiscordApplicationManager* internal_;
+    static IDiscordApplicationEvents events_;
+};
+
+} // namespace discord