Update README.md

Author: rogerfitz

README.md

@@ -4,4 +4,7 @@ If you're unfamiliar with python, we recommend you use Anaconda's Python distrib
 1. Install Python 3.6.1
 2. `conda install pandas jupyter matplotlib seaborn` -- if you use python regularly create a condenv or virutal env.
 3. `pip install sdd_api`
+4. Rename credentials.py.template to credentials.py and fill with:
+  - your username and password to [Sports Data Direct](https://www.sportsdatadirect.com)
+  - your client_id and client_secret from [Your Profile](https://www.sportsdatadirect.com/users/profile)
 4. Run `jupyter notebook` and start exploring!