Update README.md

Author: cnblogs-dudu

README.md

@@ -1,3 +1,34 @@
 # ServiceStackRedisCache
 
-Distributed cache implementation of Microsoft.Extensions.Caching.Distributed.IDistributedCache using ServiceStack.Redis.
+Distributed cache implementation of Microsoft.Extensions.Caching.Distributed.IDistributedCache using ServiceStack.Redis.Core.
+
+### Configure
+
+Startup.cs
+
+```cs
+public void ConfigureServices(IServiceCollection services)
+{
+    services.AddDistributedServiceStackRedisCache(options =>
+    {
+        Configuration.GetSection("redis").Bind(options);
+        //Workaround for deadlock when resolving host name
+        IPAddress ip;
+        if (!IPAddress.TryParse(options.Host, out ip))
+        {
+            options.Host = Dns.GetHostAddressesAsync(options.Host)
+            .Result.FirstOrDefault(a => a.AddressFamily == AddressFamily.InterNetwork).ToString();
+        }
+    });
+}
+```
+appsettings.json
+
+```json
+{
+  "redis": {
+    "Host": "xxx",
+    "Password": "xxx"
+  }
+}
+```