[docs] Import the DevTools TS Style Guide.

This imports go/devtools-tsstyle into the public documentation set.

Bug: 354102605
Change-Id: I67232f1ac56159d36cba5ad4efa577e4e4fa2134
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5796833
Auto-Submit: Benedikt Meurer <[email protected]>
Commit-Queue: Danil Somsikov <[email protected]>
Reviewed-by: Danil Somsikov <[email protected]>
diff --git a/docs/styleguide/README.md b/docs/styleguide/README.md
new file mode 100644
index 0000000..9cf8308
--- /dev/null
+++ b/docs/styleguide/README.md
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+# Chromium DevTools Style Guides
+
+This folder contains style guides relevant to the development of the Chromium
+DevTools, specifically focused on the front-end aspects of the developer tools.
+
+1. [Chromium DevTools TypeScript Style Guide (goo.gle/devtools-tsstyle)](./tsstyle/README.md)
+1. [Chromium DevTools UX Style Guide (goo.gle/devtools-ux-style-guide)](./ux/README.md)
+1. [Markdown Style Guide in Chromium](./markdown/markdown.md)