Add getting started section

Author: lulunac27a

README.md

@@ -2,4 +2,10 @@
 
 This webapp is a simple tip calculator that allows you to enter the total bill
 amount and the tip percentage. It then calculates the total amount to be paid,
-including the tip, and displays the result in a user-friendly format.
+including the tip, and displays the result in a user-friendly format.
+
+### Getting Started
+
+1. Clone the repository.
+2. Open index.html on your browser.
+3. Enter input values and that's it.

docs/index.md

@@ -2,4 +2,10 @@
 
 This webapp is a simple tip calculator that allows you to enter the total bill
 amount and the tip percentage. It then calculates the total amount to be paid,
-including the tip, and displays the result in a user-friendly format.
+including the tip, and displays the result in a user-friendly format.
+
+### Getting Started
+
+1. Clone the repository.
+2. Open index.html on your browser.
+3. Enter input values and that's it.