Update README.md

README.md

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-# xc
-Open your xcode project with Xcode of specific version 
+# xc (EXPERIMENTAL)
+Open your xcode project with Xcode of specific version.
+
+## Setup
+
+This command needs sudo password.
+
+Please set password via below command.
+
+```
+$ xc config write --sudo-password `<Your password here>`
+```
+
+Or, please create PR to fixup🙇‍♂️
+
+## Feature
+### Automatic project file searching (priority)
+1. User specified path <Optional arguments>
+2. `.xcworkspace`
+3. `.xcodeproj`
+4. `Package.swift`
+
+### Automatic Xcode version searching (priority)
+1. User specified version <Optional options>
+2. `.xcode-version` <Optional file>
+3. `$ xcode-select`
+
+## Examples
+
+```
+$ xc -v 14.2.0 # Open project file with Xcode 14.2.0
+```
+
+```
+xc > xc list
+Available Xcode:
+14.2    /Applications/Xcode.app         <Selected>
+14.1    /Applications/Xcode14.1.app
+13.4.1  /Applications/Xcode13.4.1.app
+13.2.1  /Applications/Xcode13.2.1.app
+```
+
+## Help
+
+```
+$ xc --help
+USAGE: xc <subcommand>
+
+OPTIONS:
+  --version               Show the version.
+  -h, --help              Show help information.
+
+SUBCOMMANDS:
+  list                    Available Xcodes list
+  open (default)          Shows available versions of Xcode
+  config                  Read and write xc command config. Config json is stored at `~/.config/xc/config.json`
+```
+
+```
+$ xc open --help
+OVERVIEW: Shows available versions of Xcode
+
+USAGE: xc open [-v <v>] [<path>]
+
+ARGUMENTS:
+  <path>                  File path
+
+OPTIONS:
+  -v <v>                  Open with specific Xcode version
+  --version               Show the version.
+  -h, --help              Show help information.
+```