Add namespace import instructions

Author: adamgraham

README.md

@@ -2,6 +2,12 @@
 
 The Animation Library package contains assets and scripts for animating Unity objects. Included animation scripts are Blink, Move, Orbit, Rotate, Scale, SmoothFollow, SmoothLookAt, and more. The package also contains several animation data structures and humanoid avatar masks.
 
+Import the package namespace in each class/script you want to use it. You may need to regenerate project files/assemblies first.
+
+```csharp
+using Zigurous.Animation;
+```
+
 ## Installation
 
 The Unity Package Manager can load a package from a Git repository on a remote server.