Add README for Tip Calculator project with project description and preview sections

Author: Umar-sfdc

Javascript-Projects/Tip-Calculator/README.md

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+# 💰 Tip Calculator — Minimal Web Project
+
+A clean, modern, two-page **Tip Calculator** inspired by delightful UI kits.  
+The goal is simple: enter a total amount + tip percentage → get the final amount on the next page.
+
+Designed with a minimal, soft-light aesthetic and includes smooth navigation between pages.
+
+---
+
+## 📸 Project Preview
+
+### 🌟 Main Page (Input Page)
+
+> Add your screenshot here  
+> ![Main Page Screenshot] (Javascript/Javascript-Projects/Tip-Calculator/main.png)
+
+### 🎉 Result Page (Output Page)
+
+> Add your screenshot here  
+> ![Result Page Screenshot](Javascript/Javascript-Projects/Tip-Calculator/calculate.png)
+
+Create an `/images` folder and place your screenshots like: