🚀 Feature: Implement Cryptocurrency Application as a example for react

### 🔖 Feature description

This feature is to implement the Cryptocurrency Application as an example in the repository. This is basically a react project which uses Api to fetch the data of coins.

### 🎤 Pitch

As Cryptocurrency is trending now so this project helps to know the price of coins and what the values of that coins are there in the market. It should be implemented because it keeps updated the user and aware about it. And I have implemented it. So please assign me this issue and please consider it under hacktoberfest so that I will create PR and this project might help others also.

### 👀 Have you spent some time to check if this issue has been raised before?

- [X] I checked and didn't find similar issue

### 🏢 Have you read the Code of Conduct?

- [X] I have read the [Code of Conduct](https://github.com/appwrite/appwrite/blob/HEAD/CODE_OF_CONDUCT.md)