Fill Linux howto with content

Quick and dirty but better than nothing...

HowToBuildLinux.md

@@ -1,4 +1,46 @@
 # Build Vocaluxe - HowTo (Linux)
 
-* Clone the repository (see [this](https://github.com/Vocaluxe/Vocaluxe/blob/develop/HowToBuildWin.md) for help)
+Runing Vocaluxe on Linux is not offically supported yet -but you can try it yourself.  
-* Navigate to the cloned repository and execute `make`. Make sure that all dependencies are installed and the process completes without errors.
+(the problematic part is fullfilling the runtime dependencies)
+
+
+* Install ffmpeg 3.2 (a quick and dirty compile script can be found here: [installFFmpeg.sh](https://github.com/lukeIam/Vocaluxe/blob/travis/.travis/installFFmpeg.sh) )
+* Get sure your gcc and g++ version is >= 4.8
+* Install at least mono 5.8.0 ([HowTo install mono](http://www.mono-project.com/download/stable/))
+* Clone the repository
+You want to use this branch as it contains some linux specific changes   
+(compiles on Ubuntu 14.04): [travis@lukeIam/Vocaluxe](https://github.com/lukeIam/Vocaluxe/tree/travis)
+* Navigate to the travis branch and execute (commands from [.travis.yml](https://github.com/lukeIam/Vocaluxe/blob/travis/.travis.yml)):
+```bash
+chmod ugo+x ./.build/linuxPostBuildEvent.sh
+chmod ugo+x ./.build/linuxPreBuildEvent.sh
+chmod ugo+x ./.travis/gitDescribe.sh
+wget https://dist.nuget.org/win-x86-commandline/latest/nuget.exe -P ./.travis/
+
+config=Linux platform=x64
+
+# ./.travis/gitDescribe.sh
+mono ./.travis/nuget.exe restore
+make -C PitchTracker
+make -C Vocaluxe/Lib/Video/Acinerella
+msbuild /p:Configuration=Release$config /p:Platform=$platform /p:TargetFrameworkVersion=v4.7 Vocaluxe.sln
+```
+* The build should complete without errors
+* change to the Output directory:
+```sh
+cd Output
+```
+* Start Vocaluxe:
+```bash
+mono Vocaluxe.exe
+```
+* Vocaluxe will start (you will see the splash screen) and then crash because runtime dependencies are missing    
+Required dependencies (by heart - can be incorrect and incomplete):  
+  - gstreamer 1.0
+  - ffmpeg 3.2 (maybe we can use the build script which builds the libs at the moment)
+  - hidapi
+  - libgstreamersharpglue-1.0.0
+  - portaudio
+  - ?
+  
+  * If yo make some progress we would be happy if you share it with us in a pull request/issue.