Added startup.cs to csproj, fixed typeo in comment

Author: Marcin Drobik

src/React.Owin/JsxFileOptions.cs

@@ -24,7 +24,7 @@ public class JsxFileOptions
         public IEnumerable<string> Extensions { get; set; }
 
         /// <summary>
-        /// Options for static file middle used to server JSX files.
+        /// Options for static file middleware used to server JSX files.
         /// </summary>
         public StaticFileOptions StaticFileOptions { get; set; }
     }

src/React.Sample.Owin/React.Sample.Owin.csproj

@@ -77,6 +77,7 @@
     </Compile>
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Startup.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />