Added README and screenshots

Author: Teslotik

README.md

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+# Navigator Engine
+
+Navigator Engine is a 3D viewer of the street. It supports different modes: flying across the map (`Free Fly`), predifined cameras view (`Panoramas`), `navigation` and path `routing`. Also you can enable or disable `layers`, `zoom` camera, align view to north (`compass`) and watch `tutorial`. In the future I will move navigator app into examples and separete it from the core, because it is already a game engine and a demo built on top of it. In the engine part a want to try a different approach - I use `tags` to organize hierarchy. Tags usage allows as to create parallel hierarchies such as animation, multithreading, physics, batch rendering and so on. To achive this I use `IWeakHierarchy` so child doesn't holds a reference to the parent and `IStrongHierarchy` so child holds a reference to the parent. This allows us to work with a specific types of children without filtering, also outline panel looks much cleaner, and user have more control of the engine's logic. You can also check my second engine called `Crovown`.
+
+## Demo
+
+You can switch between different modes to change camera and navigation behavior
+
+![](./docs/screenshots/demo.gif)
+
+## Screenshots
+
+![Navigation](./docs/screenshots/navigation.png)
+
+![Route](./docs/screenshots/route.png)
+
+![Free Fly](./docs/screenshots/freefly.png)
+
+## Building
+
+Tested with MSVC on Windows 10 and GCC on Fedora Linux
+
+On Windows
+
+```
+  mkdir build
+  cd build
+  cmake ..
+  msbuild engine.sln
+```
+
+On Linux
+
+```bash
+  mkdir build
+  cd build
+  cmake ..
+  make
+```