Add Catch2 and Google Test on Cmake

ToDo:
- Add compiling QElectroTech on Cmake (help needed)
- more Tests?
   - Qt Test
   - Boost Test

to test
run qtcreator
File >  open => CMakeLists.txt

tests/googletest/main.cpp

@@ -0,0 +1,15 @@
+#include <QtGui/QGuiApplication>
+#include <gtest/gtest.h>
+
+int main(int argc, char** argv)
+{
+	QGuiApplication app(argc, argv);
+
+	// disable the whole debug output (we want only the output from gtest)
+	// Debug::instance()->setDebugLevelLogFile(Debug::DebugLevel_t::Nothing);
+	// Debug::instance()->setDebugLevelStderr(Debug::DebugLevel_t::Nothing);
+
+	// init gtest and run all tests
+	::testing::InitGoogleTest(&argc, argv);
+	return RUN_ALL_TESTS();
+}