Adding dontet library sample (#200)

Author: puagarwa

samples/.NET/lib/Program.cs

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+using Microsoft.Playwright;
+using System.Runtime.InteropServices;
+
+// Function to get connection options
+static (string wsEndpoint, BrowserTypeConnectOptions options) GetConnectOptions()
+{
+    var runId = Guid.NewGuid().ToString();
+    var os = "linux"; // Change to "windows" if wants to run on Windows
+    var apiVersion = "2023-10-01-preview";// DONOT change
+    
+    var serviceUrl = Environment.GetEnvironmentVariable("PLAYWRIGHT_SERVICE_URL") ?? "";
+    var accessToken = Environment.GetEnvironmentVariable("PLAYWRIGHT_SERVICE_ACCESS_TOKEN") ?? "";
+    
+    var wsEndpoint = $"{serviceUrl}?runId={Uri.EscapeDataString(runId)}&os={os}&api-version={apiVersion}";
+    
+    var options = new BrowserTypeConnectOptions
+    {
+        Timeout = 3 * 60 * 1000, // 3 minutes
+        Headers = new Dictionary<string, string>
+        {
+            { "Authorization", $"Bearer {accessToken}" }
+        },
+        ExposeNetwork = "<loopback>", // Use loopback to expose network
+    };
+    
+    return (wsEndpoint, options);
+}
+
+using var playwright = await Playwright.CreateAsync();
+
+// Get connection options
+var (wsEndpoint, connectOptions) = GetConnectOptions();
+
+await using var browser = await playwright.Chromium.ConnectAsync(wsEndpoint, connectOptions);
+var page = await browser.NewPageAsync();
+await page.GotoAsync("https://playwright.dev/dotnet");
+var title = await page.TitleAsync();
+Console.WriteLine($"Title: {title}");
+await page.ScreenshotAsync(new()
+{
+    Path = "screenshot.png"
+});

samples/.NET/lib/ReadMe.md

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+# Run Playwright .NET tests with Microsoft Playwright Testing 
+
+This sample demonstrates how to run Playwright .NET to use browser at scale using Microsoft Playwright Testing. It showcases the benefits of accelerating test suite completion by leveraging more parallel cloud browsers. The tests are executed using dotnet library without Any runner.
+
+If you have not yet created a workspace, please follow the [Get Started guide](../../../README.md#get-started)
+
+### Sample setup
+1. Clone this sample:
+    ```powershell
+    git clone https://github.com/microsoft/playwright-testing-service
+    cd playwright-workspaces/samples/.NET/lib
+    ```
+
+1. Install dependencies:
+    ```powershell
+    dotnet add package Microsoft.Playwright.NUnit
+    ```
+   
+1. Build the project so the playwright.ps1 is available inside the bin directory:
+    ```powershell
+    dotnet build
+    ```
+
+1. Install required browsers by replacing netX with the actual output folder name, e.g. net6.0:
+
+    ```powershell
+    pwsh bin/Debug/netX/playwright.ps1 install
+    ```
+
+    If pwsh is not available, you have to [install PowerShell](https://docs.microsoft.com/powershell/scripting/install/installing-powershell).
+
+
+1. Set up environment: 
+   In the [Playwright portal](https://aka.ms/mpt/portal), copy the command under **Add region endpoint in your set up** and set the following environment variable:
+
+   ```bash
+   PLAYWRIGHT_SERVICE_URL= # Paste region endpoint URL
+    ```
+   - Generate access token following [guide](https://aka.ms/mpt/generate-access-token)
+    - Set the token generated in the previous step
+    ```
+    $env:PLAYWRIGHT_SERVICE_ACCESS_TOKEN="TOKEN_VALUE"
+    ```
+
+### Run program
+
+Run Playwright script against browsers managed by the service using the configuration you created above. You can run up to 50 parallel workers with the service
+```powershell
+    dotnet run
+``` 
+
+   
+## Next steps
+1. Follow the [quickstart guide](https://learn.microsoft.com/en-us/azure/playwright-testing/quickstart-run-end-to-end-tests?tabs=playwrightcli&pivots=nunit-test-runner)
+2. [Integrate CI/CD pipelines](https://learn.microsoft.com/en-us/azure/playwright-testing/quickstart-automate-end-to-end-testing?tabs=github&pivots=nunit-test-runner)
+3. Learn about [package options](https://learn.microsoft.com/en-us/azure/playwright-testing/how-to-use-service-config-file?pivots=nunit-test-runner).

samples/.NET/lib/lib.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Playwright" Version="1.54.0" />
+  </ItemGroup>
+
+</Project>