adds new client Pin subcommand minPinLength implementation

README.md

@@ -103,6 +103,9 @@ a few things you can personalize:
     When changing the default, resident credentials become undiscoverable without
     user verification. This helps privacy, but can make usage less comfortable
     for credentials that need less protection.
+6.  Increase the default minimum length for PINs in `ctap/storage.rs`.
+    The current minimum is 4. Values from 4 to 63 are allowed.
+    You can add relying parties to the list of readers of the minimum PIN length.
 
 ### 3D printed enclosure