Added additional according pin support.

Added more information and links to Fidoalliance specification

docs/solo/questions.md

@@ -7,7 +7,10 @@ Yes
 
 **2. Is the Pin stored and checked inside the SoloKey?**
 
-The pin is stored on the key
+The pin is stored on the key not in plain text. Only the pin hash is stored. For more information see:
+
+- [Fidoallicace specification: setting new pin][fido2_new_pin] 
+- [Fidoallicance specification: authentificator client pin][fido2_client_pin].
 
 
 **3. What happens if someone enters a faulty pin many times?**
@@ -31,3 +34,5 @@ Actually the constants are:
 
 [//]: # "links"
 [ctap_constants]: https://github.com/solokeys/solo/blob/master/fido2/ctap.h
+[fido2_new_pin]: https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html#settingNewPin)
+[fido2_client_pin]: https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html#authenticatorClientPIN