added mexican ratings

MediaBrowser.Server.Implementations/Localization/Ratings/mx.txt

@@ -0,0 +1,6 @@
+MX-AA,1
+MX-A,5
+MX-B,7
+MX-B-15,8
+MX-C,9
+MX-D,10

MediaBrowser.Server.Implementations/MediaBrowser.Server.Implementations.csproj

@@ -211,6 +211,7 @@
     <EmbeddedResource Include="Localization\Ratings\br.txt" />
     <EmbeddedResource Include="Localization\Ratings\da.txt" />
     <EmbeddedResource Include="Localization\Ratings\de.txt" />
+    <EmbeddedResource Include="Localization\Ratings\mx.txt" />
     <Content Include="swagger-ui\css\hightlight.default.css">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>