Create README.md

Author: jovezhong

tools/README.md

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+# Tools for docs
+
+This folder contains a set of tools to automate the routine docs work. You should run the command from `docs` root folder not in the tools folder.
+
+- `yarn run spellcheck` to run spell spellcheck
+- `sh tools/autogenerate-downloads.sh` to generate release-downloads.md based on file list in S3
+- `bun tools/list-pages.ts` to show nav tree based on sidebars.js and titles in markdown files
+- `bun tools/missing.js` to list which markdown files are not mounted in sidebars.js
+
+Other files probably are outdated.