Adding CONTRIBUTING.md so that github shows it on issues.

building.md

@@ -0,0 +1,45 @@
+# Building
+
+You must have a 64-bit machine for building and running the project. Always
+run your system updater before building and make sure you have the latest
+video drivers for your card.
+
+## Setup
+
+### Windows
+
+* Windows 8 or 8.1
+* Visual Studio 2015
+* [Python 2.7](http://www.python.org/download/releases/2.7.6/)
+* If you are on Windows 8, you will also need the [Windows 8.1 SDK](http://msdn.microsoft.com/en-us/windows/desktop/bg162891)
+
+Ensure Python is in your PATH (`C:\Python27\`).
+
+I recommend using [Cmder](http://bliker.github.io/cmder/) for git and command
+line usage.
+
+#### Debugging
+
+VS behaves oddly with the debug paths. Open the xenia project properties
+and set the 'Command' to `$(SolutionDir)$(TargetPath)` and the
+'Working Directory' to `$(SolutionDir)..\..`. You can specify flags and
+the file to run in the 'Command Arguments' field (or use `--flagfile=flags.txt`).
+
+To redirect output, use the following command flags:
+`--flagfile=$(SolutionDir)scratch\flags.txt 2>&1 1>$(SolutionDir)scratch\stdout.txt`
+
+### Linux
+
+Linux support is extremely experimental and incomplete.
+
+Only tested with GCC 4.9 on Ubuntu 14. [CodeLite](http://codelite.org) is the
+IDE of choice and `xb premake` will spit out files for that. Make also works via
+`xb build`.
+
+Currently building requires that CC == CXX == g++. If you know a way around this
+(to force .c files to be built with g++) let me know.
+
+## Running
+
+To make life easier you can use `--flagfile=myflags.txt` to specify all
+arguments, including using `--target=my.xex` to pick an executable.