Update the readme to point to the required SDK.

Author: wiwei

README.md

@@ -24,7 +24,7 @@ MRTK-Unity provides a set of foundational components and features to accelerate
 | `mrtk_development` |[![Build status](https://dev.azure.com/aipmr/MixedRealityToolkit-Unity-CI/_apis/build/status/public/mrtk_development-CI)](https://dev.azure.com/aipmr/MixedRealityToolkit-Unity-CI/_build/latest?definitionId=1)|
 
  # Required Software
- | [![Windows 10 Creators Update](External/ReadMeImages/MRTK170802_Short_17.png)](https://www.microsoft.com/software-download/windows10) [Windows 10 FCU](https://www.microsoft.com/software-download/windows10)| [![Unity](External/ReadMeImages/MRTK170802_Short_18.png)](https://unity3d.com/get-unity/download/archive) [Unity 3D](https://unity3d.com/get-unity/download/archive)| [![Visual Studio 2017](External/ReadMeImages/MRTK170802_Short_19.png)](http://dev.windows.com/downloads) [Visual Studio 2017](http://dev.windows.com/downloads)| [![Simulator (optional)](External/ReadMeImages/MRTK170802_Short_20.png)](https://go.microsoft.com/fwlink/?linkid=852626) [Simulator (optional)](https://go.microsoft.com/fwlink/?linkid=852626)|
+ | [![Windows SDK 18362+](External/ReadMeImages/MRTK170802_Short_17.png)](https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewSDK) [Windows SDK 18362+](https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewSDK)| [![Unity](External/ReadMeImages/MRTK170802_Short_18.png)](https://unity3d.com/get-unity/download/archive) [Unity 2018.3+](https://unity3d.com/get-unity/download/archive)| [![Visual Studio 2017](External/ReadMeImages/MRTK170802_Short_19.png)](http://dev.windows.com/downloads) [Visual Studio 2017](http://dev.windows.com/downloads)| [![Simulator (optional)](External/ReadMeImages/MRTK170802_Short_20.png)](https://go.microsoft.com/fwlink/?linkid=852626) [Simulator (optional)](https://go.microsoft.com/fwlink/?linkid=852626)|
 | :--- | :--- | :--- | :--- |
 | To develop apps for Windows Mixed Reality headsets, you need the Windows 10 Fall Creators Update | The Unity 3D engine provides support for building mixed reality projects in Windows 10 | Visual Studio is used for code editing, deploying and building UWP app packages | The Emulators allow you test your app without the device in a simulated environment |
 
@@ -43,10 +43,7 @@ MRTK-Unity provides a set of foundational components and features to accelerate
 - Diagnostic Tool
 
 # Getting Started with MRTK 
-1. [Download MRTK](Documentation/DownloadingTheMRTK.md)
-2. Follow this [Getting Started Guide](Documentation/GettingStartedWithTheMRTK.md)
-3. Check out [Mixed Reality Toolkit configuration guide](Documentation/MixedRealityConfigurationGuide.md)
-4. Check out building blocks and example scenes(see the table below)
+Please check out the [Getting Started Guide](https://microsoft.github.io/MixedRealityToolkit-Unity/Documentation/GettingStartedWithTheMRTK.html)
 
 ### More Documentation
 Find this readme, other documentation articles and the MRTK api reference on our [MRTK Dev Portal on github.io](https://microsoft.github.io/MixedRealityToolkit-Unity/). 
@@ -73,12 +70,12 @@ Join the conversation around MRTK on [Slack](https://holodevelopers.slack.com/).
 
 Ask questions about using MRTK on [Stack Overflow](https://stackoverflow.com/questions/tagged/mrtk) using the **MRTK** tag.
 
-Search for solutions or file new issues in [GitHub](https://github.com/Microsoft/MixedRealityToolkit-Unity/issues).
-
-Deep dive into future plans and learn how you can contribute to MRTK in our [wiki](https://github.com/Microsoft/MixedRealityToolkit-Unity/wiki).
+Search for [known issues](https://github.com/Microsoft/MixedRealityToolkit-Unity/issues) or file a [new issue](https://github.com/Microsoft/MixedRealityToolkit-Unity/issues) if you find something broken in MRTK code.
 
 Join our weekly community shiproom to hear directly from the feature team. (link coming soon) 
 
+Deep dive into project plan and learn how you can contribute to MRTK in our [wiki](https://github.com/Microsoft/MixedRealityToolkit-Unity/wiki). 
+
 For issues related to Windows Mixed Reality that aren't directly related to the MRTK, check out the [Windows Mixed Reality Developer Forum](https://forums.hololens.com/).
 
 This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).