Implement Continuous Integration (CI) for Automated Testing

### Description:
**Overview:**
To ensure the reliability and correctness of the SimpleBitcoin contract, it's essential to implement continuous integration (CI) for automated testing. This will allow us to run tests automatically whenever changes are made to the codebase, helping to catch bugs and regressions early in the development process.

**Proposed Changes:**

Setup Testing Framework: Choose a testing framework such as Truffle or Hardhat and set it up in the repository.
Write Test Cases: Develop comprehensive test cases to cover all aspects of the SimpleBitcoin contract, including token transfers, minting, burning, access control, and edge cases.
Define CI Workflow: Create a GitHub Actions workflow YAML file to define the CI pipeline. Configure it to run the test suite automatically on every push or pull request to the repository.
Execute Tests: Configure the CI workflow to execute the test suite against the SimpleBitcoin contract. Ensure that the tests pass successfully before merging changes into the main branch.

**Additional Considerations:**

Include code coverage analysis in the CI pipeline to measure the effectiveness of the test suite.
Integrate with code quality tools such as solhint or solidity-coverage to ensure adherence to best practices and standards.

**Labels:**

- **testing**
- **continuous integration**
- **quality assurance**