Update feature specification

[SandraSmolerEisenberg]

User Story:

• As a general manager, I want to be able to read the project's features, the requirements and the description, so that I can have a better understanding of what the application can do.

Acceptance criteria:

• Table of contents is up-to-date.
• Short description is added for each feature.
• Short usage scenario is added to each feature.
• Verified requirements.

[SandraSmolerEisenberg]

• Updated feature list on wiki home page and pages.
• Added description for each feature.
• Added example usage scenario for each feature

Contributors: @SandraSmolerEisenberg @samgun-6