Update README.md

Author: himash79

README.md

@@ -1,2 +1,14 @@
 # Java-20-Features
-Includes Java 17 related features.
+Includes Java 20 related features and JDK performance enhancement.
+
+## Requirements
+
+01) Java 20
+
+## Project setup
+
+01) Clone the project
+
+	https://github.com/himash79/Java-20-Features.git
+
+02) Figure out the features about Switch pattern, Record pattern, Updated Thread module