Add vscode terminal helper (talonhub#1395)

It makes sense that the VSCode terminal should behave like a terminal.
There's also a corresponding setting that needs to be set in VSCode. cc:
@pokey

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Pokey Rule <755842+pokey@users.noreply.github.com>

apps/vscode/README.md

@@ -5,3 +5,26 @@ It is recommended to install the [VSCode talon extension pack](https://marketpla
 ## Cursorless
 
 If you'd like to use Cursorless, follow the instructions in the [cursorless-talon repo](https://github.com/pokey/cursorless-talon).
+
+## Terminal
+
+In order to use terminal commands when the VSCode terminal is focused, you must add the following line to your [VSCode `settings.json`](https://code.visualstudio.com/docs/getstarted/settings#_settingsjson):
+
+```
+"window.title": "${activeEditorShort}${separator}${rootName}${separator}${profileName}${separator}focus:[${focusedView}]",
+```
+
+This setting will cause VSCode to include a special string in the window title whenever the terminal is focused. Talon will look for this string in the window title and activate the terminal commands in response.
+
+Note that if you have customizations in your window title that you'd like to keep, the important part is just to ensure that `focus:[${focusedView}]` appears somewhere within your custom window title.
+
+In order to enable additional terminal commands you will need to set some tags when the terminal tag is active. You can do this by creating a file in your talon settings that looks something like this:
+
+```
+tag: terminal
+-
+tag(): user.generic_unix_shell
+tag(): user.git
+tag(): user.kubectl
+tag(): user.readline
+```

apps/vscode/vscode_terminal.talon

@@ -0,0 +1,7 @@
+app: vscode
+# Looks for special string in window title.
+# NOTE: This requires you to add a special setting to your VSCode settings.json
+# See [our vscode docs](./README.md#terminal)
+win.title: /focus:\[Terminal\]/
+-
+tag(): terminal