adds some documenation for enterprise attestation

README.md

@@ -125,6 +125,9 @@ a few things you can personalize:
     length.
 1.  Increase the `MAX_CRED_BLOB_LENGTH` in `ctap/mod.rs`, if you expect blobs
     bigger than the default value.
+1.  Implement enterprise attestation. This can be as easy as setting
+    ENTERPRISE_ATTESTATION_MODE in `ctap/mod.rs`. If you want to use a different
+    attestation type than batch attestation, you have to implement it first.
 
 ### 3D printed enclosure