Add toggle-fn extension

extensions/toggle-fn/.eslintrc.json

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+{
+  "root": true,
+  "extends": ["@raycast"]
+}

extensions/toggle-fn/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# Raycast specific files
+raycast-env.d.ts
+.raycast-swift-build
+.swiftpm
+compiled_raycast_swift
+
+# misc
+.DS_Store

extensions/toggle-fn/.prettierrc

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+{
+  "printWidth": 120,
+  "singleQuote": false
+}

extensions/toggle-fn/CHANGELOG.md

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+# Toggle Fn Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [1.0.0] - 2024-08-25
+
+### Added
+
+- Initial version code

extensions/toggle-fn/README.md

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+# Toggle Fn
+
+Toggle the "Use all F1, F2, etc. keys as standard function keys" option in macOS System Preferences.
+
+Thanks to MrSimonC, the initial version code was taken from this project:
+
+Project Path: https://github.com/MrSimonC/Toggle-Mac-Function-Keys
+
+Tested with:
+
+macOS Sequoia developer beta 
+macOS Sonoma, 14.2.1 January 2024
+macOS Ventura, 13.2 January 2023
+macOS Monterey, 12.6.2, December 2022
+macOS Big Sur, 11.4, June 2021