Update README.md

Author: ehanson8

README.md

@@ -1,2 +1,6 @@
 # oclc-api
-Python scripts for retrieving data from the OCLC APIs
+Most of these scripts require a secrets.py file in the same directory that must contain the following text:
+
+  wskey='[Your OCLC WSkey]'
+
+More information about WSKeys is available [here](https://www.oclc.org/developer/develop/authentication/how-to-request-a-wskey.en.html).