update readme for faq

README.md

@@ -90,5 +90,9 @@ If you would like to alter the timeout of the token created after login or if yo
    - In the Dockerfile you will find two environment variables being set, the `ENV vulnerable=1` and the `ENV tokentimetolive=60`. Feel free to change it before running the docker build command.
 
 
+## Frequently asked questions
+ - **There is a database error upon reaching endpoints!**
+   - Make sure to issue a request towards the endpoint `/createdb` in order to populate the database.
+
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