Update README.md

Author: gena

README.md

@@ -3,5 +3,26 @@ bmi-csharp
 
 Basic Model Interface for C#. 
 
-A simple API that can be used to run native simulation components which implement BMI interface [[https://github.com/openearth/bmi]]
+A simple API that can be used to run native simulation components which implement BMI interface: [bmi.h](https://github.com/openearth/bmi/blob/master/models/include/bmi.h).
+
+Provides
+
+* C# version of the API: [IBasicModelInterface.cs](https://github.com/openearth/bmi-csharp/blob/master/src/BasicModelInterface/IBasicModelInterface.cs).
+* Universal wrapper that can be used to load any native (C/C++/FORTRAN) BMI library: [BasicModelInterfaceLibrary.cs](https://github.com/openearth/bmi-csharp/blob/master/src/BasicModelInterface/BasicModelInterfaceLibrary.cs).
+
+See [BasicModelInterfaceLibraryTest.cs](https://github.com/openearth/bmi-csharp/blob/master/src/BasicModelInterface.Tests/BasicModelInterfaceLibraryTest.cs) for examples on how to use it.
+
+In general:
+
+> var lib = new BasicModelInterfaceLibraryTest("native_library");
+> 
+> lib.Initialize("config_file");
+> 
+> lib.Update(-1);
+> 
+> var a = lib.GetValues("variable_name");
+> 
+> lib.SetValues("variable_name", a);
+>
+> lib.Finish();