update readme

Author: odaridavid

README.md

@@ -8,10 +8,15 @@
 
 ## Design Patterns
 
-Exploring Behavioral,Creational and Structural Design Patterns
+Exploring Behavioral,Creational and Structural Design Patterns in Kotlin.
 
 Feel free to improve or provide feedback on any of the patterns.
 
+## Prerequisite
+
+The project uses firebase crashlytics hence setting up a [firebase project](https://firebase.google.com/)
+will be required for a successful build.
+
 ## More References
 
 - [Design-Patterns-In-Kotlin](https://github.com/dbacinski/Design-Patterns-In-Kotlin)