message: Improve usage examples in README
diff: @@ -18,10 +18,10 @@ or by emailing age-dev+subscribe@googlegroups.com.
  ## Usage
  ```
  -Usage: rage [OPTIONS]
  +Usage: rage [OPTIONS] [INPUT]
  Positional arguments:
  - input file to read input from (default stdin)
  + INPUT file to read input from (default stdin)
  Optional arguments:
  -h, --help print help message
  @@ -33,6 +33,28 @@ Optional arguments:
  -o, --output OUTPUT output to OUTPUT (default stdout)
  ```
  +### Multiple recipients
  +
  +Files can be encrypted to multiple recipients by repeating `-r/--recipient`.
  +Every recipient will be able to decrypt the file.
  +
  +```bash
  +$ rage -o example.png.age -r age1uvscypafkkxt6u2gkguxet62cenfmnpc0smzzlyun0lzszfatawq4kvf2u \
  + -r age1ex4ty8ppg02555at009uwu5vlk5686k3f23e7mac9z093uvzfp8sxr5jum example.png
  +```
  +
  +### Passphrases
  +
  +Files can be encrypted with a passphrase by using `-p/--passphrase`.
  +
  +```bash
  +$ rage -o example.png.age -p example.png
  +Type passphrase: [hidden]
  +Confirm passphrase:
  +$ rage -d -p example.png.age >example.png
  +Type passphrase: [hidden]
  +```
  +
  ## Installation
  On Windows, Linux, and macOS, you can use the
  