Create CONTRIBUTING.md

CONTRIBUTING.md

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+Please fork, branch and pull-request any changes you'd like to make.
+
+#### Contributor Dev Machine Setup
+
+1. Clone or Fork this Repository **recursively** 
+
+    `git clone https://github.com/paloukari/TypeEdge --recurse-submodules`
+
+1. Install the latest .NET Core SDK ( the minimum version is 2.1.302 version)
+1. Replace the "CONNECTION_STRING" in the appsettings.json files with your IoT Hub **owner** connection string
+1. Open the **TypeEdge - AD Example** solution and start the emulator of one of the two examples.
+
+#### VS Code/ Visual Studio Debugging
+1. You can use the two submodules examples for developing and debugging purposes. 
+There are two examples, a simple one that has only a temperature generator, and a more complicated 
+one that is running anomaly detection on the edge with continious retraining of the model. 
+These examples reference the NuGet packages in "Debug", and the class library projects in "TemplateDevelopment" 
+configuration. It is highly recommented to work in "TemplateDevelopment". You might have to restart Visual Studio after you change to another configuration.