docs: add usage and prereq to prevent confusion

[ImBIOS]

Usage and prerequisite documentation in the README file is crucial in open source projects because it provides important information to potential users and contributors of the project. Here are some specific reasons why this documentation is important:

Helps users get started: The usage documentation in the README file can help users understand how to install and use the project. This can make it easier for them to get started and begin using the project more quickly.

Provides context: The README file can provide important context about the project, such as its purpose, features, and limitations. This can help users and contributors understand what the project is intended to do and how it fits into the larger software ecosystem.

Clarifies requirements: The prerequisite documentation in the README file can help users understand what software and tools are required to use or contribute to the project. This can prevent confusion and frustration when trying to install or use the project.

Encourages contributions: When the usage and prerequisite documentation is clear and comprehensive, it can make it easier for developers to contribute to the project. This can help to build a stronger and more active community around the project.

Improves project visibility: A well-documented README file can help the project gain more visibility and attract more users and contributors. This is especially important in the open-source community, where many users and contributors may be evaluating multiple projects at once.

Overall, the usage and prerequisite documentation in the README file is an important part of any open-source project. It helps users get started, provides context, clarifies requirements, encourages contributions, and improves project visibility.

[Sparronator9999]

May I suggest adding some descriptions for the settings as well? I had to ask @umireon what the Contour Filter did in an issue (specifically #230. It's essentially noise reduction for the background mask).

[ImBIOS]

Of Course, I'd love to add docs for that too. but, if you want to do it yourself, open a pr, and I'll merge directly to my branch.