import build instructions from wiki + link to tracker/website

Change-Id: I278c9066b541c57b6ef3b4e4420b5d535c1b475e
Tuleap: #241
Tuleap: #312

README.md

+# Windows client for Ring
+
+For more information about the ring project, see the following:
+
+- Main website: https://ring.cx/
+- Bug tracker: https://tuleap.ring.cx/projects/ring/
+- Repositories: https://gerrit-ring.savoirfairelinux.com
+
+## Requirements
+
+- Ring client library and Ring daemon
+- Mingw-w64 build environment
+- Qt5 (we link against Qt5Core, Qt5Widgets, Qt5Gui) built with Mingw
+- Qt5 Svg, Qt5 ImageFormats & Qt5 WinExtras built with Mingw
+
+## Get the source code
+
+ - ```git clone https://gerrit-ring.savoirfairelinux.com/ring-client-windows```
+
+## Build instructions
+
+*USE THE QMAKE OF Qt BUILT WITH MINGW* (e.g. /usr/bin/i686-w64-mingw32-qmake-qt5)
+
+```
+cd ring-client-windows
+mkdir build && cd build
+export QTDIR=<path to mingw qt> (e.g. /usr/i686-w64-mingw32/lib/qt)
+qmake ../RingWinClient.pro -r -spec win32-g++ RING=<Install dir of Ring and LRC> [BUILD=Debug]
+make
+make install
+```
+
+You will find all files in ./release directory.
+
+## Debugging
+
+Compile the client with 'BUILD=Debug' and libRingClient with '-DCMAKE_BUILD_TYPE=Debug'
+
+
+## Packaging
+
+* Nsis : Nullsoft Scriptable Install System :http://nsis.sourceforge.net/Main_Page.
+
+```
+cd build/release
+makensis ring.nsi
+```