feat: Implement ES256 for JWT verification (#340)

feat: Implement EC256 for JWT verification
diff --git a/docs/reference/google.auth.crypt.rst b/docs/reference/google.auth.crypt.rst
index 0833e7f..be142f4 100644
--- a/docs/reference/google.auth.crypt.rst
+++ b/docs/reference/google.auth.crypt.rst
@@ -12,4 +12,5 @@
 .. toctree::
 
    google.auth.crypt.base
+   google.auth.crypt.es256
    google.auth.crypt.rsa