chore(common): add readme file for the legacy project templates

Author: Tsvetomir-Hr

common/legacy-project-templates/README.md

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+# Telerik Project Templates Overview
+
+This folder contains predefined Telerik project templates, available in both **Server** and **WASM** hosting models. These templates demonstrate the use of Telerik UI components and common application patterns.
+
+## Predefined Project Templates
+
+1. **CRUD, Form, Chart**  
+   - [**Server Template:**](https://github.com/telerik/blazor-ui/tree/master/common/legacy-project-templates/TelerikBlazorServerCRUD) Features Telerik UI Data Grid, Chart, and form validation with a basic CRUD service for data updates.
+   - [**WASM Template:**](https://github.com/telerik/blazor-ui/tree/master/common/legacy-project-templates/TelerikBlazorWASMCRUD) Replicates the same features for WebAssembly.
+
+2. **Dashboard**  
+   - [**Server Template:**](https://github.com/telerik/blazor-ui/tree/master/common/legacy-project-templates/TelerikBlazorServerDashboard) A customizable dashboard layout using the TileLayout component, showcasing various data-fetching methods in tiles.  
+   - [**WASM Template:**](https://github.com/telerik/blazor-ui/tree/master/common/legacy-project-templates/TelerikBlazorWASMDashboard) Offers similar functionality for WebAssembly.
+
+3. **Admin**  
+   - [**Server Template:**](https://github.com/telerik/blazor-ui/tree/master/common/legacy-project-templates/TelerikBlazorServerAdmin) An admin dashboard showcasing components like Data Grid, Chart, TileLayout, and Form.  
+   - [**WASM Template:**](https://github.com/telerik/blazor-ui/tree/master/common/legacy-project-templates/TelerikBlazorWASMAdmin) Mirrors the server version in a WebAssembly environment.
+