Commit Log Message: "add docker-compose local geth"

[nsomaru]

Hello from South Africa!,

I am interested in this project. There are a series of commits with the message indicated in the title of this issue, eg here and here. As I'm not really familiar with docker, I'm not sure what these commits are for or how to gauge the health of this project.

[branciard]

Hi, we use a local blockchain to run tests on our local dev environment. So, we have a dockerfile to launch this local ethereum geth test network. We create a genesis block and create a local chain as explained here :https://github.com/ethereum/go-ethereum/wiki/Private-network. To automate this creation we then use docker.