Merge pull request 'Create cross-compile-silent-dragon-for-windows-with-mxe.md' (#7) from fekt/docs:master into master

Reviewed-on: hush/docs#7

advanced/cross-compile-silent-dragon-for-windows-with-mxe.md

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+# Cross-Compiling SilentDragon for Windows with MXE
+
+This document explains how to build Windows binaries from a Linux system. This was tested and created on Debian 11 (Bullseye).
+
+## Install Build dependencies
+```
+sudo apt-get -y install clang g++ build-essential make mingw-w64 git pkg-config libc6-dev m4 g++-multilib autoconf libncurses-dev libtool-bin unzip python zlib1g-dev wget curl bsdmainutils automake libgl1-mesa-dev libglu1-mesa-dev libfontconfig1-dev autopoint libssl-dev
+```
+
+## Install QT packages
+```
+sudo apt-get -y install qtdeclarative5-dev qt5-qmake libqt5websockets5-dev qtcreator
+``` 
+
+## Install MXE dependencies
+Current list of dependencies is here: http://mxe.cc/#requirements-debian
+
+```
+sudo apt-get install \
+    autoconf \
+    automake \
+    autopoint \
+    bash \
+    bison \
+    bzip2 \
+    flex \
+    g++ \
+    g++-multilib \
+    gettext \
+    git \
+    gperf \
+    intltool \
+    libc6-dev-i386 \
+    libgdk-pixbuf2.0-dev \
+    libltdl-dev \
+    libssl-dev \
+    libtool-bin \
+    libxml-parser-perl \
+    lzip \
+    make \
+    openssl \
+    p7zip-full \
+    patch \
+    perl \
+    python \
+    ruby \
+    sed \
+    unzip \
+    wget \
+    xz-utils
+```
+
+## Clone MXE
+```    
+git clone https://github.com/mxe/mxe.git
+``` 
+    
+## Build MXE
+
+Add `MXE_TARGETS` so we get both 32-bit and 64-bit Windows binaries.
+```
+cd mxe
+make MXE_TARGETS='x86_64-w64-mingw32.static i686-w64-mingw32.static' openssl qtbase qtwebsockets
+```
+## Add path to MXE and /usr/bin
+`export PATH=$PATH:`_/your/mxe/path_`/usr/bin`
+
+## Clone SilentDragon source
+```
+git clone https://git.hush.is/hush/SilentDragon.git
+cd SilentDragon
+```
+
+## Build latest translations
+Either
+`
+./build.sh linguist
+`
+Or
+`
+./win-build.sh linguist
+`
+## Build SilentDragon Windows binaries
+Within your SilentDragon repository run build script:
+```
+./win-build.sh release
+```
+Executable should be created and located within SilentDragon repository, IE: SilentDragon/release/silentdragon.exe
+
+**Note:** Options for `win-build.sh` include: `clean`, `cleanbuild`, `linguist`, and `release`. No option specified will build debug version by default. `winbuild.sh` compiles 64-bit binary only, but can be modified to compile 32-bit. 
+
+**Targeting 32-bit or 64-bit**
+Modify qbuild_release target in `winbuild.sh` to specify 32-bit or 64-bit
+
+To make 32-bit Windows GUI executable
+`
+i686-w64-mingw32.static-qmake-qt5 $CONF CONFIG+=release
+`
+
+To make 64-bit Windows GUI executable (default)
+`
+x86_64-w64-mingw32.static-qmake-qt5 $CONF CONFIG+=release
+`