add usage

README.md

@@ -4,6 +4,61 @@ A simple scraper to  filter and download images from kemono.party
 ## Downloader Released
 Source code is in `./main`
 
+## Usage
+
+### Download Option
+`--link [<urls>]`  
+download link, should be same site, separate by comma  
+`--creator [<service>:<id>]`  
+download creators, separate by comma  
+`--banner bool`  
+
+### Post Filter Option
+`--first int`  
+download first n post    
+`--last int`  
+download last n post  
+`--date YYYYMMDD`  
+download post on date  
+`--date-before YYYYMMDD`  
+download post before date  
+`--date-after YYYYMMDD`  
+download post after date  
+`--update YYYYMMDD`  
+download post updated on date  
+`--update-before YYYYMMDD`  
+download post updated before date  
+`--update-after YYYYMMDD`  
+
+### Image Filter Option
+download post updated after date  
+`--extensionOnly [<ext>]`  
+download post with extension, separate by comma  
+`--extensionExcept [<ext>]`  
+download post without extension, separate by comma  
+
+### Downloader Option
+`--output PATH`  
+output path  
+`--overwrite bool`  
+overwrite existing file  
+`--async bool`  
+download posts asynchronously, may cause the file order is not the same as the post order, can be used with --with-prefix-number, default false  
+`--max-download-parallel int`  
+max download file concurrent, default is 3, async mode only  
+`--with-prefix-number bool`  
+add prefix number to file name `<order>-<filename>`, default false  
+`--name-rule-only-index bool`  
+only use index as file name, default false  
+`--download-timeout int`  
+download timeout in seconds, default 300  
+`--retry int`  
+retry times, default 3  
+`--retry-interval int`  
+retry interval in seconds, default 10  
+`--rate-limit int`  
+rate limit in request/s, default 2
+
 ## Features
 With Kemono-scraper, you can implement a Downloader to take advantage of features such as multi-connection downloading, resume broken downloads, and more.