update README

README.md

@@ -1,8 +1,27 @@
 # powershell-code-page
 
+*NO NEED TO REMEMBER 65001*
+
 [![GitHub Actions: install](https://github.com/kakkun61/powershell-code-page/workflows/install/badge.svg)](https://github.com/kakkun61/powershell-code-page/actions?query=workflow%3Ainstall) [![GitHub Actions: lint](https://github.com/kakkun61/powershell-code-page/workflows/lint/badge.svg)](https://github.com/kakkun61/powershell-code-page/actions?query=workflow%3Alint) [![PowerShell Gallery](https://img.shields.io/powershellgallery/p/code-page.svg)](https://www.powershellgallery.com/packages/code-page/) [![Join the chat at https://gitter.im/powershell-code-page/community](https://badges.gitter.im/powershell-code-page/community.svg)](https://gitter.im/powershell-code-page/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
-*NO NEED TO REMEMBER 65001*
+## Usage
+
+```
+> Set-CodePage japanese
+  0:   932    shift_jis                  ANSI/OEM Japanese; Japanese (Shift-JIS)
+  1: 10001    x-mac-japanese             Japanese (Mac)
+  2: 20290    IBM290                     IBM EBCDIC Japanese Katakana Extended
+  3: 20932    EUC-JP                     Japanese (JIS 0208-1990 and 0212-1990)
+  4: 50220    iso-2022-jp                ISO 2022 Japanese with no halfwidth Katakana; Japanese (JIS)
+  5: 50221    csISO2022JP                ISO 2022 Japanese with halfwidth Katakana; Japanese (JIS-Allow 1 byte Kana)
+  6: 50222    iso-2022-jp                ISO 2022 Japanese JIS X 0201-1989; Japanese (JIS-Allow 1 byte Kana - SO/SI)
+  7: 50930                               EBCDIC Japanese (Katakana) Extended
+  8: 50931                               EBCDIC US-Canada and Japanese
+  9: 50939                               EBCDIC Japanese (Latin) Extended and Japanese
+ 10: 51932    euc-jp                     EUC Japanese
+Enter the number which you select [0-10]: 0
+chcp 932
+```
 
 ## Install
 
@@ -52,4 +71,4 @@ REMARKS
 
 ## Code Pages
 
-The list of Code pages is based on [Code Page Identifiers - Win32 apps | Microsoft Docs](https://docs.microsoft.com/en-us/windows/win32/intl/code-page-identifiers).
+The list of code pages is based on [Code Page Identifiers - Win32 apps | Microsoft Docs](https://docs.microsoft.com/en-us/windows/win32/intl/code-page-identifiers).