Update README.md

Author: norberteder

README.md

@@ -1,2 +1,24 @@
 # IdentityServer3.Contrib.Localization.UI
-Localize the UI of IdentityServer3
+
+Per default all views of [IdentityServer3](https://github.com/IdentityServer/IdentityServer3 "IdentityServer3") are not localized and in English. This solution provides a `LocalizedViewLoader` that can be used to load all views with translations. This implementation is based on the `FileSystemWithEmbeddedFallbackViewLoader` but with translation capabilities.
+
+## Install
+
+Build the solution and include the resulting assembly. Place the directories `assets` and `resources` into the root directory of your application. Be sure to set `Copy to Output Directory` to `Copy if newer`. All files are loaded into an internal cache after startup, so restart after changing views or language files.
+
+    var factory = new IdentityServerServiceFactory();
+    factory.ViewService = new Registration<IViewService>(
+        resolver => new DefaultViewService(embeddedViewServiceConfig, new LocalizedViewLoader()));
+
+The `LocalizedViewLoader` takes a paramter `directory` to override the default view directory which is `assets`.
+
+## Language files
+
+We use PO files as language files. The name of the file defines the culture:
+
+    de.po -> German
+    de-AT -> German, Austria
+
+If the requested language could not be found, the culture `en` will be searched, so be sure that this one exists.
+
+For further information how IdentityServer3 works, see [Customizing Views](https://identityserver.github.io/Documentation/docs/advanced/customizingViews.html "Customizing Views").