Dynamic Whitelist access

# Dynamic Whitelist Access

## Overview

The Dynamic Whitelist Access smart contract allows users to be dynamically added to a whitelist before an automated closing time. This contract is designed to ensure that only approved users gain access before the deadline.

## Features

- Dynamic Whitelisting: Users can be added to the whitelist before the closing time.

- Automated Closing: The contract automatically stops accepting new whitelist entries after a fixed duration (e.g., 7 days).

- Minimal Deployment: No constructor or input parameters are required at deployment.

- Efficient Access Control: Users can verify if they are whitelisted through a simple function call.

- Immutable Closing Time: The closing time is hardcoded and cannot be altered after initialization.

## Deployment Details

- Deployed Address: 0x74EBf615acd688d9EaB2f65004654bE441e9C039

- Blockchain: Edu Chain

## Functions

### init()

Initializes the contract by setting the closing time. Can only be called once.

### addToWhitelist(address user)

Allows users to be added to the whitelist before the deadline.

### isWhitelisted(address user) → bool

Returns true if the given address is whitelisted.

## How It Works

1. The contract is deployed with a predefined closing time (e.g., 7 days from initialization).

2. Users can be added dynamically to the whitelist before the deadline.

3. Once the closing time is reached, new additions are blocked.

4. Anyone can check if an address is whitelisted using isWhitelisted().

## License

This project is licensed under the MIT License.

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