add qt building info

docs/build_linux.txt

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+### Debian/Ubuntu
+
+$ sudo apt-get install build-essential libtool git libboost-system-dev libboost-program-options-dev \
+	libboost-filesystem-dev libboost-thread-dev libdb++-dev libssl-dev zlib1g-dev qt4-qmake \
+	libqt4-dev libqt5gui5 libqt5core5a libqt5dbus5 qttools5-dev qttools5-dev-tools \
+	libprotobuf-dev protobuf-compiler libqrencode-dev
+
+$ git clone https://github.com/GOSTSec/gostcoin.git
+$ cd gostcoin
+$ qmake -qt=5 RELEASE=1 USE_QRCODE=1 USE_IPV6=1 USE_BUILD_INFO=1
+$ make -j2

docs/build_win32.md

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+# Building wallet with MSYS2 MinGW under Windows
+*All actions taken under 32-bit (mingw32) shell*
+
+Replace `<treads>` to number of threads (cores) used to build.
+
+### Preparing to build
+```bash
+$ pacman -Suy diff git make tar mingw-w64-i686-gcc mingw-w64-i686-boost mingw-w64-i686-libpng mingw-w64-i686-openssl mingw-w64-i686-zlib
+$ mkdir /c/devel && cd /c/devel
+```
+#### Building Berkley DB
+```bash
+$ wget http://download.oracle.com/berkeley-db/db-4.8.30.tar.gz
+$ tar xzf db-4.8.30.tar.gz
+$ cd db-4.8.30/build_unix
+$ ../dist/configure --enable-mingw --enable-cxx --disable-replication --prefix=/mingw32
+$ make -j <threads> && make install
+```
+#### Building QREncode
+```bash
+$ cd ../..
+$ wget https://fukuchi.org/works/qrencode/qrencode-4.0.0.tar.gz
+$ tar xzf qrencode-4.0.0.tar.gz
+$ cd qrencode-4.0.0
+$ ./configure --enable-static --prefix=/mingw32
+$ make -j <threads> && make install
+```
+#### Cloning repository
+```bash
+$ cd ..
+$ git clone https://github.com/GOSTSec/gostcoin.git
+$ cd gostcoin
+```
+
+### Building wallet daemon
+```bash
+$ cd src
+$ make -f makefile.mingw -j <threads>
+```
+
+### Building Qt 5.9 Opensource staticly
+**[!] Requires Python 2.7**
+
+[Download](https://www.python.org/downloads/release/python-2714/) and install Python, for example, to `C:\devel\Python27` and add it to PATH
+```bash
+$ export PATH="$PATH:/c/devel/Python27"
+```
+
+### Building QT
+```bash
+$ wget http://download.qt.io/official_releases/qt/5.9/5.9.2/single/qt-everywhere-opensource-src-5.9.2.zip
+$ unzip qt-everywhere-opensource-src-5.9.2.zip
+$ cd qt-everywhere-opensource-src-5.9.2
+$ CXXFLAGS="--Wno-deprecated-declarations" ./configure -static -release -opensource -confirm-license -platform win32-g++ -prefix "C:\devel\qt5.9.2-static" -nomake examples -nomake tests -nomake tools -opengl desktop -no-angle -make libs -qt-zlib -qt-libpng -qt-libjpeg -qt-freetype -qt-pcre -sql-sqlite
+$ make -j <threads> && make install
+```
+
+### Build wallet with QT
+```bash
+$ export PATH="$PATH:/c/devel/qt5.9.2-static/bin"
+$ qmake RELEASE=1 USE_QRCODE=1 USE_IPV6=1 USE_BUILD_INFO=1
+$ make -j <threads>
+```
+
+**Copyright © 2018 R4SAS <r4sas@i2pmail.org>**