CSV Tool - Wails-based CSV editor with spreadsheet UI

Features:
- Spreadsheet-like table with cell navigation (arrow keys)
- Formula bar for editing cell values
- Click and drag cell selection with Shift+Arrow extend
- Column resize by dragging header borders, double-click for best fit
- Editable headers via double-click
- Command palette (Cmd+P) with 12 commands
- Copy/Cut/Paste with CSV, Markdown, and Jira formats
- Insert rows/columns above/below/left/right
- File drag-and-drop to open CSV files
- Native Open/Save dialogs
- Go backend for CSV parsing, formatting, and file I/O
- Vanilla JS frontend, no frameworks

Co-authored-by: Shelley <shelley@exe.dev>

build/README.md

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+# Build Directory
+
+The build directory is used to house all the build files and assets for your application. 
+
+The structure is:
+
+* bin - Output directory
+* darwin - macOS specific files
+* windows - Windows specific files
+
+## Mac
+
+The `darwin` directory holds files specific to Mac builds.
+These may be customised and used as part of the build. To return these files to the default state, simply delete them
+and
+build with `wails build`.
+
+The directory contains the following files:
+
+- `Info.plist` - the main plist file used for Mac builds. It is used when building using `wails build`.
+- `Info.dev.plist` - same as the main plist file but used when building using `wails dev`.
+
+## Windows
+
+The `windows` directory contains the manifest and rc files used when building with `wails build`.
+These may be customised for your application. To return these files to the default state, simply delete them and
+build with `wails build`.
+
+- `icon.ico` - The icon used for the application. This is used when building using `wails build`. If you wish to
+  use a different icon, simply replace this file with your own. If it is missing, a new `icon.ico` file
+  will be created using the `appicon.png` file in the build directory.
+- `installer/*` - The files used to create the Windows installer. These are used when building using `wails build`.
+- `info.json` - Application details used for Windows builds. The data here will be used by the Windows installer,
+  as well as the application itself (right click the exe -> properties -> details)
+- `wails.exe.manifest` - The main application manifest file.