chore: add legacy project templates

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.
+

common/legacy-project-templates/TelerikBlazorServerAdmin/TelerikBlazorServerAdmin.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.4.33103.184
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TelerikBlazorServerAdmin", "TelerikBlazorServerAdmin\TelerikBlazorServerAdmin.csproj", "{5E27769C-0C62-4798-A08E-1D87964CCD09}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5E27769C-0C62-4798-A08E-1D87964CCD09}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5E27769C-0C62-4798-A08E-1D87964CCD09}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5E27769C-0C62-4798-A08E-1D87964CCD09}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5E27769C-0C62-4798-A08E-1D87964CCD09}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {5B31FD59-784D-4927-AAA8-81FEE269DF48}
+	EndGlobalSection
+EndGlobal

common/legacy-project-templates/TelerikBlazorServerAdmin/TelerikBlazorServerAdmin/App.razor

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+<CascadingAuthenticationState>
+    <Router AppAssembly="@typeof(Program).Assembly">
+        <Found Context="routeData">
+            <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+        </Found>
+        <NotFound>
+            <LayoutView Layout="@typeof(MainLayout)">
+                <p>Sorry, there's nothing at this address.</p>
+            </LayoutView>
+        </NotFound>
+    </Router>
+</CascadingAuthenticationState>