Add Directory Structure

Directory-Structure.md

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+PowerTools needs to store some things persistently on the local device for functionality. The locations and usages are contained below.
+
+# Logs
+
+## Release 
+Logs are written to the `/tmp/powertools.log` file.
+
+## Debug
+Logs are written to the `~/powertools.log` file.
+
+# Settings profiles
+
+The filename format is `<app_id>.ron` where `<app_id>` is the game's AppId, or `default_settings` for no game (main menu settings). The file format is RON with the file structure base defined in [file.rs](https://git.ngni.us/NG-SD-Plugins/PowerTools/src/branch/main/backend/src/persist/file.rs).
+
+## Decky
+
+Per-game settings are stored by Steam AppId in `~/homebrew/settings/PowerTools`.
+
+## Other
+
+Everything is unceremoniously dumped into `/tmp`.
+
+# Executable files
+
+## Decky
+
+Decky installs PowerTools to the `~/homebrew/plugins/PowerTools` folder.
+
+## Other
+
+This is arbitrary i.e. user-defined