Add README

README.md

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+# ScrCpy
+
+This project displays screens of Android devices plugged on USB in live.
+
+
+## Run
+
+### Runtime requirements
+
+This projects requires _FFmpeg_, _LibSDL2_ and _LibSDL2-net_.
+
+#### Linux
+
+Install the packages from your package manager. For example, on Debian:
+
+    sudo apt install ffmpeg libsdl2-2.0.0 libsdl2-net-2.0.0
+
+
+#### Windows
+
+From [MSYS2]:
+
+    pacman -S mingw-w64-x86_64-SDL2
+    pacman -S mingw-w64-x86_64-SDL2_net
+    pacman -S mingw-w64-x86_64-ffmpeg
+
+[MSYS2]: http://www.msys2.org/
+
+
+#### MacOS
+
+TODO
+
+
+## Build
+
+The project is divided into two parts:
+ - the server, running on the device (in `server/`);
+ - the client, running on the computer (in `app/`).
+
+The server is a raw Java project requiring Android SDK. It not an Android
+project: the target file is a `.jar`, and a `main()` method is executed with
+_shell_ rights.
+
+The client is a C project using [SDL] and [FFmpeg], built with [Meson]/[Ninja].
+
+The root directory contains a `Makefile` to build both parts.
+
+[sdl]: https://www.libsdl.org/
+[ffmpeg]: https://www.ffmpeg.org/
+[meson]: http://mesonbuild.com/
+[ninja]: https://ninja-build.org/
+
+
+### Build requirements
+
+Install the [Android SDK], the JDK 8 (`openjdk-8-jdk`), and the packages
+described below.
+
+[Android SDK]: https://developer.android.com/studio/index.html
+
+
+#### Linux
+
+    sudo apt install make gcc openjdk-8-jdk pkg-config meson zip \
+                     libavcodec-dev libavformat-dev libavutil-dev \
+                     libsdl2-dev libsdl2-net-dev
+
+
+#### Windows
+
+Install these packages:
+
+    pacman -S mingw-w64-x86_64-make
+    pacman -S mingw-w64-x86_64-gcc
+    pacman -S mingw-w64-x86_64-pkg-config
+    pacman -S mingw-w64-x86_64-meson
+    pacman -S zip
+
+Java 8 is not available in MSYS2, so install it manually and make it available
+from the `PATH`:
+
+    export PATH="$JAVA_HOME/bin:$PATH"
+
+### Generate
+
+Make sure your `ANDROID_HOME` variable is set to your Android SDK directory:
+
+    export ANDROID_HOME=~/android/sdk
+
+From the project root directory, execute:
+
+    make release
+
+This will generate the application in `dist/scrcpy/`.
+
+
+## Run
+
+Plug a device, and execute:
+
+    ./scrcpy
+
+If several devices are listed in `adb devices`, you must specify the _serial_:
+
+    ./scrcpy 0123456789abcdef
+
+To change the default port (useful to launch several `scrcpy` simultaneously):
+
+    ./scrcpy -p 1234