Add README for fed2021.

diff --git a/README.md b/README.md
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+++ b/README.md
@@ -39,6 +39,7 @@ Currently ustaxlib supports the following models:
 
 - [**fed2019**](src/fed2019/README.md)
 - [**fed2020**](src/fed2020/README.md)
+- [**fed2021**](src/fed2021/README.md)
 
 ## Getting Started
 

diff --git a/src/fed2021/README.md b/src/fed2021/README.md
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+# ustaxlib/fed2021
+
+Forms for US tax year 2021.
+
+This is an *overlay* of the [fed2020](../fed2020/README.md) module. An overlay module inherits (and
+therefore supports) all of the forms from its parent.
+
+# Adjustments
+Currently this module only updates the tax table and inflation-adjusted constants of the **Tax
+Return**.