chore: adding disposable token generation example

examples/DisposableTokens/DisposableTokens.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Remove="Momento.Sdk" />
+    <None Remove="Microsoft.SourceLink.GitHub" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Momento.Sdk" Version="1.20.0" />
+  </ItemGroup>
+</Project>

examples/DisposableTokens/Program.cs

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+using System;
+using Momento.Sdk;
+using Momento.Sdk.Auth;
+using Momento.Sdk.Auth.AccessControl;
+using Momento.Sdk.Config;
+using Momento.Sdk.Responses;
+
+ICredentialProvider authProvider = new EnvMomentoTokenProvider("MOMENTO_AUTH_TOKEN");
+
+IAuthClient client = new AuthClient(AuthConfigurations.Default.Latest(), authProvider);
+var scope = new DisposableTokenScope(Permissions: new List<DisposableTokenPermission>
+{
+    new DisposableToken.CacheItemPermission(
+        CacheRole.ReadWrite,
+        CacheSelector.ByName("cache"),
+        CacheItemSelector.AllCacheItems
+    ),
+    new DisposableToken.CachePermission(
+        CacheRole.ReadOnly,
+        CacheSelector.ByName("topsecret")
+    ),
+    new DisposableToken.TopicPermission(
+        TopicRole.PublishSubscribe,
+        CacheSelector.ByName("cache"),
+        TopicSelector.ByName("example-topic")
+    )
+});
+var tokenResponse = await client.GenerateDisposableTokenAsync(
+    scope,
+    ExpiresIn.Minutes(5)
+);
+
+if (tokenResponse is GenerateDisposableTokenResponse.Success token)
+{
+    Console.WriteLine("The generated disposable token is: " + token.AuthToken);
+    Console.WriteLine("The token endpoint is: " + token.Endpoint);
+    Console.WriteLine("The token expires at (epoch timestamp): " + token.ExpiresAt.Epoch());
+}
+else if (tokenResponse is GenerateDisposableTokenResponse.Error err)
+{
+    Console.WriteLine("Error generating disposable token: " + err.Message);
+}

examples/DisposableTokens/README.md

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+<img src="https://docs.momentohq.com/img/logo.svg" alt="logo" width="400"/>
+
+# Disposable Tokens Example