Adds Discover Ethereum & Solidity (bkrem#28)

Author: t4t5

README.md

@@ -40,6 +40,7 @@ Please check the [contribution guidelines](CONTRIBUTING.md) for info on formatti
 - [Solidity Github Repo](https://github.com/ethereum/solidity/) - Source code.
 
 #### Tutorials
+- [Discover Ethereum & Solidity](https://www.ludu.co/course/ethereum) - Complete course that takes you through the process of creating a decentralized Twitter clone using best practices.
 - [Monax Smart Contract Tutorial](https://monax.io/docs/solidity/) - Tutorial series which begins with a very simple smart contract and teaches how to gradually increase the complexity of your contracts with relevant design patterns.
 - [Solidity Workshop](https://github.com/androlo/solidity-workshop) - Comprehensive series of tutorials covering contract-oriented programming and advanced language concepts.
 - [Upgradable Contracts](https://blog.colony.io/writing-upgradeable-contracts-in-solidity-6743f0eecc88#.lhsir2mzo) - Medium article on writing upgradable contracts.