docs: update readme

README.md

@@ -15,6 +15,7 @@ url = "https://www.youtube.com"         # full yt url
 throttle = 1                            # throttle yt request
 range = "1:5:1"                         # [START][:STOP][:STEP]
 after_date = "20250326"                 # not in use
+cookies = "./cookies.txt"               # pass user cookies to yt
 ```
 
 `subs-opml.xml`:

internal/config/config.go

@@ -13,6 +13,7 @@ type Provider struct {
 	Range      string
 	After_date string
 	Cmd        string
+	Cookies    string
 }
 
 type Config struct {

internal/dl/dl.go

@@ -62,6 +62,7 @@ func Get(d Download, p config.Provider) {
 		"--playlist-items", p.Range,
 		"--restrict-filenames",
 		"--embed-metadata",
+		"--cookies", p.Cookies,
 	)
 
 	stdout, err := cmd.StdoutPipe()