Starting work on (Shared)ExtSaveData archive

src/core/fs/archive_ext_save_data.cpp

@@ -0,0 +1,17 @@
+#include "fs/archive_ext_save_data.hpp"
+#include <memory>
+
+bool ExtSaveDataArchive::openFile(const FSPath& path) {
+	Helpers::panic("ExtSaveDataArchive::OpenFile: Failed");
+	return false;
+}
+
+ArchiveBase* ExtSaveDataArchive::openArchive(const FSPath& path) {
+	Helpers::panic("ExtSaveDataArchive::OpenArchive: Failed. Path type: %d", path.type);
+	return nullptr;
+}
+
+std::optional<u32> ExtSaveDataArchive::readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) {
+	Helpers::panic("ExtSaveDataArchive::ReadFile: Failed");
+	return std::nullopt;
+}