939871: Added Readme file for Support to Load and Save Custom Fonts in FreeText annotations

Author: VenkadaSubramanian-Durai

Annotations/FreeText/README.md

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+## Custom Font Support for FreeText Annotation
+The Blazor SfPdfViewer allows you to load, edit, and save custom fonts in FreeText annotations using the [FallbackFontCollection](https://help.syncfusion.com/cr/blazor/Syncfusion.Blazor.SfPdfViewer.PdfViewerBase.html#Syncfusion_Blazor_SfPdfViewer_PdfViewerBase_FallbackFontCollection) and [FontFamilies](https://help.syncfusion.com/cr/blazor/Syncfusion.Blazor.SfPdfViewer.PdfViewerBase.html#Syncfusion_Blazor_SfPdfViewer_PdfViewerBase_FontFamilies) properties
+
+Documentation: https://blazor.syncfusion.com/documentation/pdfviewer-2/annotation/free-text-annotation#edit-free-text-annotation-programmatically
+
+## Project pre-requisites
+To run this application, you need Visual Studio 2019 or later versions.
+
+## Deploying and running the sample
+To debug while running the application, press F5 or select Debug > Start Debugging. To run the sample without debugging, press Ctrl+F5 or selectDebug > Start Without Debugging.