NSTextView with checkbox function -- 2

Just as the standard note app in MacOS we want to be able to add checkboxes to our NSTextView. Here are the requirements: - Developed in Swift 5 - No third party software - Must target MacOS 10.14 and above - Well documented in English. Functions Required: - [ ] Add a checkbox to the start of the line - [ ] Add a checkbox to the next line when hitting return - [ ] Remove checkbox when hitting the backspace key and the cursor is next to the checkbox - [ ] Don’t let the cursor move beyond the checkbox - [x] Checkbox will change to selected state when clicked - [ ] Checkbox cannot be selectable as text - [ ] Allow ability for indentation when hitting the tab key - [ ] When hitting return and adding the next checkbox respect the indentation - [ ] When hitting shift + tab reduce indentation. Please see video for exact function requirement.