Create CONTRIBUTING.md

Author: Roblinde

CONTRIBUTING.md

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+We appreciate any community contributions to this project, whether in the form of issues or Pull Requests.
+
+This document outlines what we'd like you to follow in terms of commit messages and code style.
+
+It also explains what to do in case you want to setup the project locally and run tests.
+
+# Setup
+
+This project is written using Visual Studio 2017 RC and the latest dotnet core SDKs. Clone the repository, run `dotnet restore` 
+and then `dotnet build` to compile.
+
+# Code style
+
+This project uses Microsoft standard code styles. They can be found in the `editorstyles.config` file. Read more at [editorconfig.org](http://EditorConfig.org)
+
+# Running tests
+
+To run the tests for this solution, either start the runner from within visual studio or run `dotnet test` in the test project directories.