add README.md

README.md

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+<p align="center">
+  <img src="audiodecoder.sacd/icon.png" />
+</p>
+
+------------------
+
+[![License: GPL-2.0-or-later](https://img.shields.io/badge/License-GPL%20v2+-blue.svg)](LICENSE.md)
+[![Build Status](https://travis-ci.org/xbmc/audiodecoder.sacd.svg?branch=Matrix)](https://travis-ci.org/xbmc/audiodecoder.sacd/branches)
+[![Build Status](https://dev.azure.com/teamkodi/binary-addons/_apis/build/status/xbmc.audiodecoder.sacd?branchName=Matrix)](https://dev.azure.com/teamkodi/binary-addons/_build/latest?definitionId=74&branchName=Matrix)
+[![Build Status](https://jenkins.kodi.tv/view/Addons/job/xbmc/job/audiodecoder.sacd/job/Matrix/badge/icon)](https://jenkins.kodi.tv/blue/organizations/jenkins/xbmc%2Faudiodecoder.sacd/branches/)
+<!--- [![Build Status](https://ci.appveyor.com/api/projects/status/github/xbmc/audiodecoder.sacd?branch=Matrix&svg=true)](https://ci.appveyor.com/project/xbmc/audiodecoder-sacd?branch=Matrix) -->
+
+# audiodecoder.sacd addon for Kodi
+
+This is a [Kodi](https://kodi.tv) audiodecoder addon for SACD isos.
+
+## Build instructions
+
+When building the addon you have to use the correct branch depending on which version of Kodi you're building against.
+If you want to build the addon to be compatible with the latest kodi `master` commit, you need to checkout the branch with the current kodi codename.
+Also make sure you follow this README from the branch in question.
+
+### Linux
+
+The following instructions assume you will have built Kodi already in the `kodi-build` directory.
+suggested by the README.
+
+1. `git clone --branch master https://github.com/xbmc/xbmc.git`
+2. `git clone --branch Matrix https://github.com/xbmc/audiodecoder.sacd.git`
+3. `cd audiodecoder.sacd && mkdir build && cd build`
+4. `cmake -DADDONS_TO_BUILD=audiodecoder.sacd -DADDON_SRC_PREFIX=../.. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=../../xbmc/kodi-build/addons -DPACKAGE_ZIP=1 ../../xbmc/cmake/addons`
+5. `make`
+
+The addon files will be placed in `../../xbmc/kodi-build/addons` so if you build Kodi from source and run it directly.
+the addon will be available as a system addon.