Add missing client credentials

csharp/ServiceCollectionExtensions.cs

@@ -1,5 +1,4 @@
-using System;
-using Microsoft.Rest;
+using System;
 using Streetcred.ServiceClients;
 
 namespace Microsoft.Extensions.DependencyInjection

csharp/Streetcred.ServiceClients.csproj

@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="2.2.0" />
-    <PackageReference Include="Microsoft.Rest.ClientRuntime" Version="2.3.20" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="2.2.0" />
+    <PackageReference Include="Microsoft.Rest.ClientRuntime" Version="2.3.20" />
   </ItemGroup>
 </Project>

csharp/StreetcredClientCredentials.cs

@@ -0,0 +1,37 @@
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Options;
+using Microsoft.Rest;
+// ReSharper disable CheckNamespace
+
+namespace Microsoft.Extensions.DependencyInjection
+{
+    internal class StreetcredClientCredentials : ServiceClientCredentials
+    {
+        /// <summary>
+        /// Gets the options.
+        /// </summary>
+        /// <value>
+        /// The options.
+        /// </value>
+        public ServiceClientOptions Options { get; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="StreetcredClientCredentials"/> class.
+        /// </summary>
+        /// <param name="options">The options.</param>
+        public StreetcredClientCredentials(IOptions<ServiceClientOptions> options)
+        {
+            Options = options.Value;
+        }
+
+        /// <inheritdoc />
+        public override Task ProcessHttpRequestAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+        {
+            request.Headers.Add("Authorization", $"Bearer {Options.AccessToken}");
+            request.Headers.Add("X-Streetcred-Subscription-Key", Options.SubscriptionKey);
+            return base.ProcessHttpRequestAsync(request, cancellationToken);
+        }
+    }
+}