Create version.md

Author: victorhuangwq

diagnostics/version.md

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+# Figuring out SDK and runtime version
+
+SDK and runtime verion number of WebView2 is helpful for someone who is trying to reproduce a bug. The follow options are ways for you to obtain the version numbers of the host app.
+
+### Option 1: Use WebView2 Utilities (SDK and runtime)
+An easy way to obtain the SDK and runtime version for any host app that is currently running, is to use [WebView2Utilities](https://github.com/david-risney/WebView2Utilities).
+
+### Option 2a: Check NuGet Package Manager (SDK only)
+If you are a developer for the WebView2 application, on Visual Studio Code, go to `Tools > NuGet Package Manager > Manage NuGet Packages for Solution`, and see the SDK version that is being used for the project
+
+### Option 2b: Check WebView2 child process of host app (Runtime only)
+For any application, to check the which WebView2 runtime is being used, do the following:
+
+1. Open Task Manager
+2. Right click on the WebView2 process of the application you are interested in
+3. Click on Open File Location
+
+The directory of the file location is the WebView2 runtime version