doc: document tools directory (README.md)

tools/README.md

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+# Tools Directory
+
+This directory contains tools for developing and running puter.
+Each directory inside `/tools` is an npm workspace, so it can have its own
+package.json file and dependencies.
+
+## Scripts
+
+### `run-selfhosted.js`
+
+This is the main script for running a local instance of Puter.
+It verifies the version of node.js you are running and attempts to explain
+any errors that come up if initiating boot fails.
+
+Puter is booted with essential modules, and modules required for local
+file storage.
+
+### `gen-release-notes.js`
+
+Generates release notes between a hard-coded pair of versions. These versions
+need to be modified manually in the script source before running.
+
+### `check-translations.js`
+
+Checks for missing translations in `src/gui/src/i18n/translations`
+
+## Utilities
+
+### `comment-writer`
+
+Generates comments in source files using generative AI via Puter's AI drivers.
+
+To use this:
+- `cd` into the `tools/comment-writer` directory
+- Edit `config.json` and replace `auth_token` with your own
+- Run with a specified direcotry; for example:
+  `node main.js ../../src/backend/services`
+
+### `module-docgen`
+
+Document a module.
+
+## Libraries
+
+### comment-parser
+
+This is a package used by the `license-headers` tool to process existing
+comments.
+
+### file-walker
+
+This is used by `license-headers` and `comment-writer` to walk through
+source files.