Add feeds dev script and README entries

README.md

···
    ```bash
    cp apps/api/.env.example apps/api/.env
    cp apps/web/.env.example apps/web/.env
+   cp apps/feeds/.env.example apps/feeds/.env
    cp .env.example .env
    # Edit the .env files to add your configurations
    ```
···
 10. Start musicbrainz:
    ```bash
    bun run mb
+   ```
+11. Start feeds:
+   ```bash
+   bun run feeds
    ```
 11. Start the development server:
    ```bash

package.json

···
     "dev:webscrobbler": "cargo run -p rockskyd --release -- webscrobbler",
     "dev:tracklist": "cargo run -p rockskyd --release -- tracklist",
     "db:pgpull": "cargo run -p rockskyd --release -- pull && rm -f rocksky-analytics.ddb* rocksky-feed.ddb* && curl -o rocksky-analytics.ddb https://backup.rocksky.app/rocksky-analytics.ddb && curl -o rocksky-feed.ddb https://backup.rocksky.app/rocksky-feed.ddb",
+    "dev:feeds": "cd apps/feeds && deno task dev",
     "mb": "cd musicbrainz && go run main.go",
     "spotify": "cd apps/api && bun run spotify",
     "build:raichu": "cd crates/raichu && wasm-pack build --release --target web && cp -r pkg ../../apps/web/src",
···
     "apps/uploads",
     "apps/xata-proxy"
   ]
-}
+}