Update plugin directory read me (#2181)

The read me is supposed to describe the plugin subdirectories. This adds
documentation for subdirectories added after the read me was last
updated. The subdirectories themselves usually have more detailed
documentation. While I was here, I capitalized Talon.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: FireChickenProductivity

plugin/README.md

@@ -1,21 +1,27 @@
 # plugin
 
-The plugin folder has several other subfolders containing various commands:
+The plugin folder has several other subfolders containing various commands and features:
 
-- `cancel` contains commands to make talon ignore a command
+- `are_you_sure` lets you require confirmation before executing an action, which can be useful for potentially destructive commands like shutting down your computer or exiting Talon.
+- `breaking_changes_notice` notifies the user if the breaking changes file has been updated.
+- `cancel` contains commands to make Talon ignore a command
 - `command_history` has commands to see previous commands
 - `datetimeinsert` has commands to automatically write the current date and time
 - `desktops` has commands to navigate between the different computer desktops
 - `draft_editor` has some of the commands to open and use a built-in pop-up text editor
 - `dropdown` has commands to select an option from a dropdown menu
+- `gamepad` has default bindings for using a gamepad device to do tasks like clicking, scrolling and moving your cursor.
+- `listening_timeout` has a setting for turning off speech recognition if Talon does not detect any commands for the specified number of minutes.
 - `macro` has commands to use macros
 - `media` has commands for video and volume control
 - `microphone_selection` has commands for selecting a microphone to use
 - `mode_indicator` does not have commands, but has settings for enabling a graphical mode indicator
 - `mouse` has commands to click, drag, scroll, and use an eye tracker
+- `new_user_message` shows a message intended for new users.
 - `repeater` has commands for repeating other commands, described briefly in the top level [README](https://github.com/talonhub/community?tab=readme-ov-file#repeating-commands)
 - `screenshot` has commands for taking screenshots
 - `symbols` has commands for inserting certain symbols, like pairs of parentheses or quotation marks
 - `talon_draft_window` has the rest of the commands for using the draft editor window
-- `talon_helpers` has commands helpful for debugging, opening the talon directory, and getting updates
+- `talon_helpers` has commands helpful for debugging, opening the Talon directory, and getting updates
 - `text_navigation` has commands for navigating the cursor in text
+- `then` has a command that does nothing, which is sometimes useful for command chaining.