Add initial implementation of Unit Test framework

LICENSE.md

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+MIT License
+
+Copyright (c) .NET Foundation and Contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

NuGet.Config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <packageSources>
+        <add key="NuGet" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
+        <add key="Azure Artifacts nanoFramework dev" value="https://pkgs.dev.azure.com/nanoframework/feed/_packaging/sandbox/nuget/v3/index.json" protocolVersion="3" />
+    </packageSources>
+</configuration>

README.md

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-# nanoFramework.TestPlatform
 nanoFramework Unit Test platform
+[![License](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE) [![NuGet](https://img.shields.io/nuget/dt/nanoframework.TestFramework.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoframework.TestFramework/) [![#yourfirstpr](https://img.shields.io/badge/first--timers--only-friendly-blue.svg)](https://github.com/nanoframework/Home/blob/master/CONTRIBUTING.md) [![Discord](https://img.shields.io/discord/478725473862549535.svg?logo=discord&logoColor=white&label=Discord&color=7289DA)](https://discord.gg/gCyBu8T)
+
+![nanoFramework logo](https://github.com/nanoframework/Home/blob/master/resources/logo/nanoFramework-repo-logo.png)
+
+-----
+
+# Welcome to the **nanoFramework** Unit Test Framework repository!
+
+## Build status
+
+| Component | Build Status | NuGet Package |
+|:-|---|---|
+| nanoframework.TestFramework | [![Build Status](https://dev.azure.com/nanoframework/nanoframework.TestFramework/_apis/build/status/nanoFramework.TestFramework?repoName=nanoframework%2FnanoFramework.TestFramework&branchName=master)](https://dev.azure.com/nanoframework/nanoframework.TestFramework/_build/latest?definitionId=67&repoName=nanoframework%2FnanoFramework.TestFramework&branchName=master) | [![NuGet](https://img.shields.io/nuget/v/nanoframework.TestFramework.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoframework.TestFramework/) |
+| nanoframework.TestFramework (preview) | [![Build Status](https://dev.azure.com/nanoframework/nanoframework.TestFramework/_apis/build/status/nanoFramework.TestFramework?repoName=nanoframework%2FnanoFramework.TestFramework&branchName=develop)](https://dev.azure.com/nanoframework/nanoframework.TestFramework/_build/latest?definitionId=67&repoName=nanoframework%2FnanoFramework.TestFramework&branchName=develop) | [![](https://badgen.net/badge/NuGet/preview/D7B023?icon=https://simpleicons.now.sh/azuredevops/fff)](https://dev.azure.com/nanoframework/feed/_packaging?_a=package&feed=sandbox&package=nanoframework.TestFramework&protocolType=NuGet&view=overview) |
+
+## What is the .NET nanoFramework Test Framework
+
+nanoFramework TestFramework it's a Unit Test framework dedicated to .NET nanoFramework! It has all the benefits of what you're used to when using Microsoft Test platform for .NET or XUnit or any other!
+
+The framework includes multiple elements that are distributed in a single NuGet package!
+
+- `nanoFramework.TestFramework` which contains the attributes to decorate your code and the `Assert` classes to check that you're code is properly doing what's expected.
+- `nanoFramework.UnitTestLauncher` which is the engine launching and managing the Unit Tests.
+- `nanoFramework.TestAdapter` which is the Visual Studio Test platform adapter, allowing to have the test integration in Visual Studio.
+
+The integration looks like that:
+
+![test integration](assets/test-integration-vs.jpg)
+
+And the integration will point you up to your code for successful or failed tests:
+
+![test integration failed](assets/test-integration-vs-failed.jpg)
+
+## Usage of .NET nanoFramework Test Framework
+
+Simply add the `nanoFramework.TestFramework` nuget to your project and you're good to go!
+
+![test nuget](assets/test-nuget-test-framework.jpg)
+
+Once you'll build your project, the tests will be automatically discovered:
+
+![test discovered](assets/test-discovered.jpg)
+
+You can then run all the tests and you'll get the result:
+
+![test success](assets/test-success.jpg)
+
+To have more details on usage of the framework, please refer to the detailed [documentation here](https://docs.nanoframework.net/).
+
+## What you'll find in this repository
+
+This repository contains the source of the core elements. You'll find them in `sources` directory. The Visual Studio projects in the root directory will open those elements. 
+
+## Sample pack
+
+You can find on our samples repo a [sample pack](https://github.com/nanoframework/Samples/tree/master/samples/UnitTest) with projects demoing how to use the Unit Test Framework.
+
+## Feedback and documentation
+
+For documentation, providing feedback, issues and finding out how to contribute please refer to the [Home repo](https://github.com/nanoframework/Home).
+
+Join our Discord community [here](https://discord.gg/gCyBu8T).
+
+## Credits
+
+The list of contributors to this project can be found at [CONTRIBUTORS](https://github.com/nanoframework/Home/blob/master/CONTRIBUTORS.md).
+
+## License
+
+The .NET **nanoFramework** Test Framework is licensed under the [MIT license](LICENSE.md).
+
+## Code of Conduct
+
+This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community.
+For more information see the [.NET Foundation Code of Conduct](https://dotnetfoundation.org/code-of-conduct).
+
+### .NET Foundation
+
+This project is supported by the [.NET Foundation](https://dotnetfoundation.org).