docs: update README files

Author: tsvetomir

sample-apps/README.md

@@ -0,0 +1,5 @@
+# Kendo UI for Angular: Sample Projects
+
+This folder holds the source code for sample applications from the Kendo UI for Angular [documentation](http://www.telerik.com/kendo-angular-ui/components).
+
+> The majority of the sample applications still reside in separate repositories. Please refer to [the documentation](http://www.telerik.com/kendo-angular-ui/components) for a full list of examples.

sample-apps/pdf-export/embedded-fonts/README.md

@@ -1,4 +1,6 @@
-# EmbeddedFonts
+# Kendo UI for Angular: PDF Export - Embedded Fonts
+
+This repository holds the source code for the article on [PDF Export - Embedded Fonts](https://www.telerik.com/kendo-angular-ui/components/pdfexport/embedded-fonts/) from the Kendo UI for Angular suite.
 
 This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 7.3.5.