npm install
npm run start
npm install
npm run build
npm install -s hardhat @nomiclabs/hardhat-ethers 'ethers@^5.0.0'
npx hardhat
vi hardhat.config.js
vi ./contracts/MedicalPCRCertificate.sol
npx hardhat compile
npx hardhat node
vi ./scripts/deploy.js
npx hardhat run --network local scripts/deploy.js