addPosition implemented, changes to election Model

[BautistaBertolami]

Fixes #45

Description

addPosition creates a Position object and stores it in the positions array of the election document. The election model's positions array was changed to use a object literal array instead of a Positions object array

(UPDATE)
The positions array is no longer a thing, addPositions now initializes a Position collection inside of our election document.
The elections collection has been renamed to election, and the singular election document should use "election" as it's ID.
Various function names were renamed from elections to election, e.g. closeElections is now closeElection

Types of changes

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

Checklist:

• My code follows the code style of this project found on ESLint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[BautistaBertolami]

Quick correction, the commit says event, that should say election. I keep getting the two names confused.

[jeffjramos21]

looks good, just implement the changes sofia brought up and I'll approve

[jeffjramos21]

looks good