Created Building from Source (markdown)

Building-from-Source.md

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+## Binaries
+
+Users are recommended to use the [pre-built xemu binaries](https://github.com/mborgerson/xemu/wiki#download). If you would like to build from source however, follow the instructions for your platform below.
+
+## Windows
+
+Windows builds are cross-compiled from Ubuntu. If you would like to build *on* Windows, you can use WSL2 and Docker. See [official Docker
+documentation](https://docs.docker.com/docker-for-windows/wsl/) for how to get WSL2 and Docker set up.
+
+```bash
+# Clone and build
+git clone https://github.com/mborgerson/xemu.git
+docker run --rm -v $PWD/xemu:/xemu -w /xemu \
+    -e CCACHE_DIR=/xemu/ccache \
+    mborgerson/xemu-ubuntu-win64-cross:latest \
+    ./build.sh -p win64-cross
+
+# Run
+./xemu/dist/xemuw.exe
+```
+
+## macOS
+
+First install the [Homebrew package manager](https://brew.sh/).
+
+```bash
+# Install dependencies
+brew update
+brew install glib pixman sdl2 libepoxy coreutils pkg-config dylibbundler libsamplerate ninja
+
+# Clone and build
+git clone https://github.com/mborgerson/xemu.git
+cd xemu
+./build.sh
+
+# Run
+open ./dist/xemu.app
+```
+
+## Linux
+
+### Debian/Ubuntu
+```bash
+# Install dependencies
+sudo apt update
+sudo apt install build-essential libsdl2-dev libepoxy-dev libpixman-1-dev libgtk-3-dev libssl-dev libsamplerate0-dev ninja-build
+
+# Clone and build
+git clone https://github.com/mborgerson/xemu.git
+cd xemu
+./build.sh
+
+# Run
+./dist/xemu
+```