Add Spectra.

thirdparty/include/Spectra/Util/Version.h

@@ -0,0 +1,16 @@
+// Copyright (C) 2020-2022 Yixuan Qiu <yixuan.qiu@cos.name>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+#ifndef SPECTRA_VERSION_H
+#define SPECTRA_VERSION_H
+
+#define SPECTRA_MAJOR_VERSION 1
+#define SPECTRA_MINOR_VERSION 0
+#define SPECTRA_PATCH_VERSION 1
+
+#define SPECTRA_VERSION (SPECTRA_MAJOR_VERSION * 10000 + SPECTRA_MINOR_VERSION * 100 + SPECTRA_PATCH_VERSION)
+
+#endif  // SPECTRA_VERSION_H