Add: number of unique questions

Author: danieldanielecki

README.md

@@ -32,7 +32,7 @@
 4. Questions are similar to the actual exam, without duplications (like in other courses ;-)).
 5. The Practice Tests Exams simulate the actual exam's content, timing, and percentage required to pass the exam.
 6. This course is **not** a Professional Scrum Product Owner (PSPO I) Exam Dump. Some people use brain dumps or exam dumps, but that's absurd, which we don't practice.
-7. xxx **unique** questions.
+7. 264 **unique** questions.
 
 ## ☝️ Course Updates