add qtimgui renderer library

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+# QtImGui
+
+Qt (QOpenGLWidget / QOpenGLWindow) backend for [ImGui](https://github.com/ocornut/imgui)
+
+It enables ImGui to run in QOpenGLWidget / QOpenGLWindow.
+
+[![https://gyazo.com/eb68699c96b9147cca3d5ea9fadfc263](https://i.gyazo.com/eb68699c96b9147cca3d5ea9fadfc263.gif)](https://gyazo.com/eb68699c96b9147cca3d5ea9fadfc263)
+
+## How to use
+
+* Add QtImGui sources and headers to your project
+    * If you are using git submodule, run `git submodule update --init --recursive` to ensure that the inner submodule is initialized as well.
+* Add `include(path/to/qtimgui.pri)` to youre `.pro` file
+* Subclass `QOpenGLWindow` or `QOpenGLWidget` and:
+
+```cpp
+class DemoWindow : public QOpenGLWindow
+{
+protected:
+    void initializeGL() override
+    {
+        QtImGui::initialize(this);
+    }
+    void paintGL() override
+    {
+        // you can do custom GL rendering as well in paintGL
+
+        QtImGui::newFrame();
+
+        ImGui::Text("Hello");
+        // more widgets...
+
+        ImGui::Render();
+    }
+};
+```
+
+See [QOpenGLWidget example](demo-widget/demo-widget.cpp) and [QOpenGLWindow example](/demo-window/demo-window.cpp) for details.