Add YouTube.os.js: Reddit Comments on YouTube user script

README.md

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+# Reddit.openscript
+
+User scripts for Reddit integrations powered by [OpenScript](https://github.com/GetOpenScript/OpenScript).
+
+## Scripts
+
+### 1. Reddit Comments on YouTube (`YouTube.os.js`)
+
+Embeds relevant Reddit discussion threads and comments directly above the native YouTube comment section on any YouTube video page.
+
+#### Features
+- **Zero API Keys & Read-Only:** Queries public Reddit JSON endpoints without credentials or cookies. Completely anonymous.
+- **Dual Comment Display:** YouTube comments remain visible and accessible directly beneath the Reddit discussion section.
+- **Multiple Threads Support:** Displays clickable subreddit tabs sorted by `top` score.
+- **Official Subreddit Detection:** Automatically detects subreddit links in video descriptions and badges matching threads as `Official`.
+- **Collapsible Comment Trees:** Clean nested thread view with `[–]` and `[+]` collapse toggles.
+- **Native YouTube Theming:** Adapts seamlessly to YouTube's light and dark themes using YouTube CSS color variables.
+- **Always Fresh:** No caching, so newly submitted threads appear on page navigation.
+
+#### Installation
+1. Install [OpenScript](https://chromewebstore.google.com/detail/openscript/dkelmgdchndagjemmodhkphdikhpnfol) (requires version `1.0.4` or newer for `OpenScript.fetch`).
+2. Open the OpenScript popup and click **New Script**.
+3. Copy and paste the contents of [`YouTube.os.js`](YouTube.os.js) into the editor.
+4. Save the script and ensure it is enabled.
+5. Open any YouTube video with Reddit discussions (e.g. trailers, music videos, podcasts).