Add readme.

README.md

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+# newsboat-yt
+Plugin to download / enqueue youtube videos from rss subscriptions in newsboat.
+
+## Dependencies / Requirements
+The following package are required.
+- yt-dlp
+- golang
+
+## Installation
+```bash
+sudo make install
+```
+
+## Uninstall
+```bash
+sudo make uninstall
+```
+
+## Usage
+```bash
+Usage of newsboat-yt:
+  -d    start downloading from queue.
+  -u string
+        add url to download queue.
+```