Add initial README.md with project overview and contribution guidelines

README.md

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+# ANTI-BS
+
+Simple YouTube member-video filter with a whitelist.
+
+## How it works
+
+- Member-only videos are detected and hidden by default.
+- A whitelist lets specific creators stay visible.
+- Add both the display name and the channel link/handle.
+- If you are on a whitelisted channel page (like `https://www.youtube.com/@DaveMani/videos`),
+  nothing is hidden there.
+
+## Whitelist input
+
+- Channel name: the visible name under the video (example: `Dave Mani`)
+- Channel link or @handle: `@DaveMani` or `https://www.youtube.com/@DaveMani/videos`
+
+## Contributing
+
+MRs are allowed but mostly rejected. If you want to propose a change, open an MR
+with a small, focused diff and explain the reason clearly.