README.md

Hello World smart contract

Initialize an sample contract project
- Execute: truffle init
- Add the following setting to the truffle.js, so that we can communicate with the local blockchain node.
```
module.exports = { 
  networks: { 
    development: { 
      host: '127.0.0.1', 
      port: 8545, 
      network_id: '*' } 
  } 
};
```
Compile and deploy the contract
- Execute: truffle compile
- Execute: truffle migrate
Invoking the contract through truffle console
- Execute: truffle console
- Execute the command inside the console:
```
truffle(development)>  

Hello.deployed().then((instance) => instance.greetUser("Alice"));
```
- This will return a response "Hello Alice" in the hexa decimal format.