Created with remix-solidity ide (an online free ide for solidity).
Solidity is an object-oriented, high-level language for implementing smart contracts. Smart contracts are programs which govern the behaviour of accounts within the Ethereum state.
For more details about solidity head over here - https://solidity.readthedocs.io/en/v0.6.1/
This smart contract has the simplest implementation i.e transactions of cryptocurrency across any Blockchain network in Ethereum virtual machine. Investors can buy and sell cryptocurrencies.