[nostalgia] Add CLion config

.idea/fileTemplates/internal/C++ Class.cc

@@ -0,0 +1,13 @@
+/*
+ * Copyright 2016 - 2021 gary@drinkingtea.net
+ *
+ * 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 http://mozilla.org/MPL/2.0/.
+ */
+ 
+#[[#include]]# "${HEADER_FILENAME}"
+
+${NAMESPACES_OPEN}
+
+${NAMESPACES_CLOSE}