Update README

README.md

@@ -9,7 +9,7 @@ The main reasons behind Granian design are:
 - Have a single, correct HTTP implementation, supporting versions 1, 2 (and eventually 3)
 - Provide a single package for several platforms 
 - Avoid the usual Gunicorn + uvicorn + http-tools dependency composition on unix systems
-- Provide stable performance when compared to existing alternatives
+- Provide stable [performance](https://github.com/emmett-framework/granian/blob/master/benchmarks/README.md) when compared to existing alternatives
 
 ## Features
 
@@ -66,6 +66,50 @@ and serve it using:
 
     $ granian --interface rsgi main:app
 
+## Options
+
+You can check all the options provided by Granian with the `--help` command:
+
+```shell
+$ granian --help
+Usage: granian [OPTIONS] APP
+
+Arguments:
+  APP  Application target to serve.  [required]
+
+Options:
+  --host TEXT                     Host address to bind to.  [default:
+                                  127.0.0.1]
+  --port INTEGER                  Port to bind to.  [default: 8000]
+  --interface [asgi|rsgi|wsgi]    Application interface type.  [default: rsgi]
+  --http [auto|1|2]               HTTP version.  [default: auto]
+  --ws / --no-ws                  Enable websockets handling  [default:
+                                  (enabled)]
+  --workers INTEGER RANGE         Number of worker processes.  [default: 1;
+                                  x>=1]
+  --threads INTEGER RANGE         Number of threads.  [default: 1; x>=1]
+  --threading-mode [runtime|workers]
+                                  Threading mode to use.  [default: workers]
+  --loop [auto|asyncio|uvloop]    Event loop implementation  [default: auto]
+  --backlog INTEGER RANGE         Maximum number of connections to hold in
+                                  backlog.  [default: 1024; x>=128]
+  --log-level [critical|error|warning|warn|info|debug]
+                                  Log level  [default: info]
+  --log-config FILE               Logging configuration file (json)
+  --ssl-keyfile FILE              SSL key file
+  --ssl-certificate FILE          SSL certificate file
+  --url-path-prefix TEXT          URL path prefix the app is mounted on
+  --reload / --no-reload          Enable auto reload on application's files
+                                  changes  [default: no-reload]
+  --version                       Shows the version and exit.
+  --install-completion [bash|zsh|fish|powershell|pwsh]
+                                  Install completion for the specified shell.
+  --show-completion [bash|zsh|fish|powershell|pwsh]
+                                  Show completion for the specified shell, to
+                                  copy it or customize the installation.
+  --help                          Show this message and exit.
+```
+
 ## Project status
 
 Granian is currently under active development.