Added proper license and attribution statements

ReadMe.md

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+  - **Status:** Stable and mature. Several projects are using this library,
+    and it has received extensive testing on Linux and Windows.
+
+  - **Platforms:** Cross-platform, developed on Linux but also tested and
+    working without any known issues on Windows.
+
+Nuclex.Windows.Forms
+====================
+
+This is a lightweight MVVM framework for Windows Forms. It is based on
+the "convention over configuration" idea and requires zero configuration.
+Rather than set up view mappings and view model services, you can simply
+ask it to display a view model (`ExampleViewModel`) with its default view
+and it will figure out what the correct view is by name (i.e. `ExampleForm`).
+
+There are unit tests for the whole library, so everything is verifiably
+working on all platforms tested (Linux, Windows, Raspberry).