doc: optimize instructions

README.md

@@ -1,2 +1,53 @@
 # RVC-Models-Downloader
 Quickly download RVC models in 🤗 Hugging Face.
+
+## Quick Start
+### Preparation
+Put this program into the root directory of RVC.
+### Download All Assets
+```bash
+rvcmd assets/all
+```
+### Download Latest General Pack (Windows Only)
+```bash
+rvcmd packs/general/latest
+```
+### Download ffmpeg Tools (Windows Only)
+```bash
+rvcmd tools/ffmpeg
+```
+
+## Full Usage
+```bash
+Usage: rvcmd [-notrs] [-dns dns.yaml] 'target/to/download'
+  -dns string
+        custom dns.yaml
+  -notrs
+        use standard TLS client
+  'target/to/download'
+        like packs/general/latest
+All available targets:
+    assets:
+        all    hubert    rmvpe    uvr5    v1    v2
+    packs:
+        amd:
+            latest
+            v2:
+                20230813    20231006
+        general:
+            latest
+            v1:
+                20230331    20230416    20230428    20230508    20230513    20230516    20230717
+            v2:
+                20230528    20230618
+        intel:
+            latest
+            v2:
+                20230813    20231006
+        nvidia:
+            latest
+            v2:
+                20230813    20231006
+    tools:
+        ffmpeg
+```

main.go

@@ -28,7 +28,7 @@ func main() {
 	flag.Parse()
 	args := flag.Args()
 	if len(args) != 1 {
-		fmt.Println("Usage:", os.Args[0], "[-notrs] 'target/to/download'")
+		fmt.Println("Usage:", os.Args[0], "[-notrs] [-dns dns.yaml] 'target/to/download'")
 		flag.PrintDefaults()
 		fmt.Println("  'target/to/download'\n        like packs/general/latest")
 		fmt.Println("All available targets:")