add Apache license info to own source files

core/src/DatabaseStorage.cpp

@@ -1,3 +1,19 @@
+/*
+* Copyright 2018 Coati Software KG
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
 #include "DatabaseStorage.h"
 
 #include <vector>
@@ -7,13 +23,6 @@
 #include "utility.h"
 #include "version.h"
 
-
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 namespace sourcetrail
 {
 	// --- Public Interface ---