Add initial README
Add rspec
Basic setup and Circuit class
Add component class
Add Circuit#components
Allow adding components to circuits
Raise error if trying to add invalid component
Add Component#name
Add pry gem
Add test group in Gemfile
Add DC source
Add Source::DC#voltage
Add units to integer
Use units in dc spec
Add Component#pins
Add basic pin

With name and voltage
Add bin/bench workbench command

An IRB session w/ included Electronics