Additional Parser Functionality

[mitevpi]

Vuese is a great tool for documenting Vue.js applications and components. We've been using it in our organization with positive results, and felt that the community might benefit from functionality that we wanted to build in to support internal processes and workflows.

This pull request adds the following functionality:

• Add parsing for Computed Properties
• Add parsing for Watched Properties
• Add parsing for Data Object

In addition to the functionality, the pull request adds the following resources:

• Samples folder demonstrating the notation for the newly-parsable properties
• Instructions on how to run/test a local build of Vuese
• Testing for the new parser functionality

We hope that this PR is consistent with the quality and direction that you've set in place for your project. Please let us know if you have any feedback on how we can improve this to be more helpful to the community.

[HcySunYang]

@mitevpi
This is amazing work, thank you very much for your efforts. I am sure this is the same as our goal and give me some time to check it out.