Added the readme content

Author: thangavele

README.md

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+# Blazor: Live Preview Markdown Editor’s Content Using Markdig Library
+
+Integrate the Markdig third-party library into Syncfusion Blazor Rich Text Editor’s Markdown editor (MD editor) to preview the Markdown.
+
+## Prerequisites
+ 
+- [Visual Studio 2019](https://visualstudio.microsoft.com/vs/).
+- [.NET Core 3.0](https://dotnet.microsoft.com/download/dotnet/3.0) or above.
+- [Markdig](https://www.nuget.org/packages/Markdig/).
+
+
+## How to run the project
+
+Step 1: Check out this repository in your disk.
+
+Step 2: Open the solution file using the Visual Studio 2019 Preview 16.6.0 Preview 2.0 or later.
+
+Step 3: Restore the NuGet packages by rebuilding the solution.
+
+Step 5: Run the project.