Add basic install and license info to readme.

README.md

@@ -1,2 +1,9 @@
-# sn-preview-aspose
+# sensenet Preview with Aspose
 Implementation of the sensenet Preview provider and image generator using Aspose libraries.
+
+> **License**: please note that although the sensenet code and binaries are available here and on NuGet, to use the preview generator in production, you will have to acquire an [Aspose](https://aspose.com) license (or a sensenet Enterprise license that covers that too).
+
+> For installation details please refer to the readme of the NuGet packages and the main sensenet [documentation site](https://docs.sensenet.com/).
+
+[![NuGet](https://img.shields.io/nuget/v/SenseNet.Preview.Aspose.svg)](https://www.nuget.org/packages/SenseNet.Preview.Aspose)
+[![NuGet](https://img.shields.io/nuget/v/SenseNet.Preview.Aspose.Install.svg)](https://www.nuget.org/packages/SenseNet.Preview.Aspose.Install)