Update README.md

Author: AhmedAlyasergy

README.md

@@ -1 +1,16 @@
 # Readme
+# Simple Interest Calculator
+
+This project is a simple shell script that calculates the simple interest based on user input.  
+The user provides:
+- Principal amount
+- Rate of interest
+- Time duration
+
+The script then calculates the interest using the formula:
+
+## Author
+Ahmed Alyasergy
+
+## License
+This project is licensed under the Apache 2.0 License.