Add style guide

[jmanuel1]

Include a style guide for F# code. Perhaps, include a style guide for prose too.

An example F# style guide: https://docs.microsoft.com/en-us/dotnet/fsharp/style-guide/

An example prose style guide: https://plainlanguage.gov/guidelines/

Currently, there is no style guide being followed (except for Visual F#'s suggestions). There should be an F# style guide to follow and prose guidelines to follow. This will help make the code easier to read, better designed, and more maintainable. A prose guide will help improve documentation making it clear and easier to read.

These enhancements would be useful in maintaining the consistency of code and prose.