Implement ISslContext (#440)

This PR implement an empty `ISslContext` and update `CreateContext` and `SetInterfaceVersion` inside `ISslService`

Ryujinx.HLE/HOS/Services/Ssl/ISslContext.cs

@@ -0,0 +1,20 @@
+using Ryujinx.HLE.HOS.Ipc;
+using System.Collections.Generic;
+
+namespace Ryujinx.HLE.HOS.Services.Ssl
+{
+    class ISslContext : IpcService
+    {
+        private Dictionary<int, ServiceProcessRequest> m_Commands;
+
+        public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => m_Commands;
+
+        public ISslContext()
+        {
+            m_Commands = new Dictionary<int, ServiceProcessRequest>()
+            {
+                //...
+            };
+        }
+    }
+}