C++ build instructions

doc/build.md

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+# Build dependencies and instructions
+
+## C++ version
+
+## Windows
+#### Dependencies
+1. Visual studio 2017 ([official download](https://www.visualstudio.com/downloads/))
+1. Boost 1.67 ([installation and build instructions](https://www.boost.org/doc/libs/1_67_0/more/getting_started/windows.html))
+
+#### Instructions
+1. Clone repository https://github.com/tevador/moddable
+1. Build the XS engine using the batch file `moddable\build\makefiles\win\build.bat`
+1. Clone this repository.
+1. Open and build the solution `RandomJS\src-cpp\randomjs.sln` in Visual studio.
+1. Copy `moddable\build\bin\win\release\xst.exe` to the same directory as `randomjs.exe`. 
+
+## Linux
+#### Dependencies
+1. GCC 5+ (tested with 6.3)
+1. Boost 1.67 ([installation and build instructions](https://www.boost.org/doc/libs/1_67_0/more/getting_started/unix-variants.html))
+
+#### Instructions
+1. Clone repository https://github.com/tevador/moddable
+1. Build the XS engine: `cd moddable/build/makefiles/lin && make`.
+1. Clone this repository.
+1. Build randomjs: `cd RandomJS/src-cpp && make`.
+1. Copy `moddable/build/bin/lin/release/xst` to `RandomJS/src-cpp/bin`.
+
+## C# version (testing only)
+
+### Windows
+#### Dependencies
+1. Visual studio 2017 ([official download](https://www.visualstudio.com/downloads/))
+1. NodeJS ([official download](https://nodejs.org/en/download))
+
+#### Instructions
+1. Build the solution in Visual studio.
+1. Open the command prompt in the src directory.
+1. Run `npm install`.
+1. Run the javascript sandbox: `node sandbox.js`.
+1. Run `Tevador.RandomJS.exe` or `Tevador.RandomJS.Miner.exe` in a separate command prompt.
+
+### Linux
+#### Dependencies
+1. Mono 4.0+ ([via package manager](http://www.mono-project.com/download/stable/#download-lin)). For recent Ubuntu and Debian distros, install using `sudo apt-get install mono-devel`.
+1. NodeJS ([via package manager](https://nodejs.org/en/download/package-manager/)). For recent Ubuntu and Debian distros, install using `curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -` and `sudo apt-get install -y nodejs`
+
+#### Instructions
+1. Build with `make`.
+1. Run `npm install`.
+1. Run the javascript sandbox: `node sandbox.js`.
+1. Run `mono Tevador.RandomJS.exe` or `mono Tevador.RandomJS.Miner.exe` in a separate terminal window.