feat: add expense tracker demo

Author: TRIPLE-ADE

community/demos/expense-tracker.md

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+## 1. Expense Tracking
+[Expense Tracking](https://copilotkit-expense-tracker.vercel.app/) - 
+An Expense Tracker with Copilot, Shadcn-UI, Next js and Groq API. This allows user to add, delete, update expense with Copilot kit chat interface and also the input section.
+
+## 2. Name of Issue/Topic
+
+11 - Budget Tracker (Hacktoberfest Demo) #623
+
+## 3. Technologies Being Used
+
+List the technologies and frameworks you used (e.g., CopilotKit, Next.js)
+
+### Note: Please only use the [Shadcn/ui]([https://v0.dev/docs](https://ui.shadcn.com/docs/installation)) for styling components.
+
+- v0 Styling
+- Shadcn-UI Component Styling
+- CopilotKit
+- Nextjs
+- Groq API
+
+## 4. GitHub Project Link
+
+### GitHub Repo Link: 
+[Github Link](https://github.com/TRIPLE-ADE/copilotkit-expense-tracker)
+
+### 5 bonus points
+
+- If your app is live, include the link here:
+[Live Demo](https://copilotkit-expense-tracker.vercel.app/)
+
+## 6. Screenshot
+
+Include a screenshot of your demo in action:
+![image](https://github.com/TRIPLE-ADE/copilotkit-expense-tracker/blob/main/public/Screenshot2.png)
+
+## 7. Who Are You?
+
+Please list your **GitHub** and **Twitter** handles if you feel comfortable doing so. 
+
+We want to promote what you've built and your hard work
+- [Abdulrasheed on Github](https://github.com/TRIPLE-ADE)
+- [Abdulrasheed on Linkedin](https://www.linkedin.com/in/abdulsalam-dev)
+
+## 5 Extra Bonus Points
+
+Link to any bonus activities you did such as solving GitHub Issues or posting to Twitter, Dev.to, Medium, etc related to your project and CopilotKit.