Implement a buffer structure/type for incoming commands

[lymacasm]

This task involves creating a file to buffer data/ commands coming in. This task can either be done before the #8 task, or in conjunction with it, as these two are heavily inter-related. Ask me if you want more details!

You should implement functions to add data to a buffer, and pop data from the buffer.

[lymacasm]

We'll probably just reuse the buffer files from the MotorController1.0 repo.

[lymacasm]

Added the buffer files to master. Closing issue.