Create README.md

Author: gammasoft71

Qt.Widgets/Controls/Widget/README.md

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+# Widget
+
+Shows how to create a widget with QWidget.
+
+## Sources
+
+[src/Widget.h](src/Widget.h)
+
+[src/Widget.cpp](src/Widget.cpp)
+
+[CMakeLists.txt](CMakeLists.txt)
+
+## Output
+
+![Screenshot](../../../docs/Pictures/Widget.png)
+
+## Generate and build
+
+### Qt Creator
+
+To build these projects, open `Widget.pro` file with Qt Creator.
+
+### CMake
+
+To build this project, open "Terminal" and type following lines:
+
+Set `CMAKE_PREFIX_PATH` with Qt6 install path.
+
+#### Windows :
+
+``` cmake
+mkdir build
+cd build
+cmake ..
+start ./Widget.sln
+```
+
+#### macOS :
+
+``` cmake
+mkdir build
+cd build
+cmake .. -G "Xcode"
+open ./Widget.xcodeproj
+```
+
+#### Linux with Code::Blocks :
+
+``` cmake
+mkdir build
+cd build
+cmake .. -G "CodeBlocks - Unix Makefiles"
+xdg-open ./Widget.cbp > /dev/null 2>&1
+```
+
+#### Linux :
+
+``` cmake
+mkdir build
+cd build
+cmake .. 
+cmake --build . --config Debug
+./Widget
+```