Update README.md

README.md

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 ![Main Window Screenshot](https://raw.githubusercontent.com/stenzek/duckstation/md-images/main.png)
 
 ## Features
- - System Simulation
+ - CPU Recompiler/JIT (x86_64 work-in-progress, AArch64 planned)
- - Debugging Windows
+ - Hardware (D3D11 and OpenGL) and software rendering
- - Resolution Upscaling
+ - Upscaling and true colour (24-bit) in hardware renderers
+ - "Fast boot" for skipping BIOS splash/intro
+ - Save state support
+ - Windows and Linux support - macOS may work, but not supported by author
+
+## Building
+Clone the respository with submodules (`git clone --recursive` or `git clone` and `git submodule update --init`).
+
+### Windows
+Requirements:
+ - Visual Studio 2019
+
+1. Open the Visual Studio solution `duckstation.sln` in the root, or "Open Folder" for cmake build.
+2. Build, binaries are located in `bin/x64`.
+3. Copy the DLL files from `dep/msvc/bin64` to the binary directory.
+4. Run `duckstation-x64-Release.exe` or whichever config you used.
+
+### Linux
+Requirements:
+ - CMake
+ - SDL2
+
+1. Create a build directory, either in-tree or elsewhere.
+2. Run cmake to configure the build system. Assuming a build subdirectory of `build-release`, `cd build-release && cmake -DCMAKE_BUILD_TYPE=Release -GNinja ..`.
+3. Compile the source code. For the example above, run `ninja`.
+4. Run the binary, located in the build directory under `src/duckstation/duckstation`.
+
+## Running
+1. Configure the BIOS path in the settings.
+2. Open a disc image file, enjoy.
+
+## Default keyboard bindings
+Keyboard bindings are currently not customizable. For reference:
+ - **D-Pad:** W/A/S/D or Up/Left/Down/Right
+ - **Triangle/Square/Circle/Cross:** I/J/L/K or Numpad8/Numpad4/Numpad6/Numpad2
+ - **L1/R1:** Q/E
+ - **L2/L2:** 1/3
+ - **Start:** Enter
+ - **Select:** Backspace
+
+Gamepads are automatically detected and supported. Tested with an Xbox One controller.
+To access the menus with the controller, press the right stick down and use the D-Pad to navigate, A to select.
+
+## Useful hotkeys
+ - **F1-F8:** Quick load/save (hold shift to save)
+ - **F11:** Toggle fullscreen
+ - **Tab:** Temporarily disable speed limiter
+ - **Pause/Break:** Pause/resume emulation
+ - **Space:** Frame step
+ - **End:** Toggle software renderering
+ - **Page Up/Down:** Increase/decrease resolution scale in hardware renderers
 
 ## Tests
-TODO: Fill in tests list - CPU/GTE/GPU
+ - Passes amidog's CPU and GTE tests, partial passing of CPX tests
 
 ## Screenshots
 ![Spyro 2](https://raw.githubusercontent.com/stenzek/duckstation/md-images/spyro.jpg)