added browser extension proof of concept

browser_extension/README.md

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+# Tube Archivist Companion
+A browser extension to directly add videos from YouTube to Tube Archivist.
+
+## MVP or better *bearly viable product*
+This is a proof of concept with the following functionality:
+- Add your Tube Archivist connection details in the addon popup
+- Inject a download button into youtube search results page
+- Clicking the button will automatically add the video to the your download queue
+
+## Test this extension
+- Firefox
+  - Open `about:debugging#/runtime/this-firefox`
+  - Click on *Load Temporary Add-on*
+  - Select the *manifest.json* file to load the addon. 
+- Chrome / Chromium
+  - Open `chrome://extensions/`
+  - Toggle *Developer mode* on top right
+  - Click on *Load unpacked*
+  - Open the folder containing the *manifest.json* file.
+
+## Help needed
+This is only minimally useful in this state. Join us on our Discord and please help us improve that.
+
+## Note:
+- For mysterious reasons sometimes the download buttons will only load when refreshing the YouTube search page and not on first load... Hence: Help needed!
+- For your testing environment only for now: Point the extension to the newest *unstable* build.