Netting Project: PR 1 of n

[sanket1729]

The project will probably have lots of PRs coming the way. I am making small PRs for fast development and easy review/merges.

Although this PR does not add any functionality by itself, I think merging this will save development and review time in the future. Let me know if you have any issues with this approach. And we can decide on another way of doing this.

I am also trying to maintain this project as a standalone project without reliance on this codebase, but I don't think that effort is warranted for now. I am using a custom .gitignore file for this project.

As of now, this PR supports:

• [x] Creation of transaction and balances from initial values

• [x] Client reading the data from files and saving in-memory structures.

• [x] Tests for the correct functioning of these files

[sanket1729]

Tracked in #410

[amiller]

Closing as we're working on another branch