Add How to Use and Terms sections

Author: ttsukagoshi

README.md

@@ -3,7 +3,17 @@
 [![clasp](https://img.shields.io/badge/built%20with-clasp-4285f4.svg?style=flat-square)](https://github.com/google/clasp) [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
 [![Lint Code Base](https://github.com/ttsukagoshi/sheetsL/actions/workflows/linter.yml/badge.svg)](https://github.com/ttsukagoshi/sheetsL/actions/workflows/linter.yml) [![Publish Release](https://github.com/ttsukagoshi/sheetsL/actions/workflows/deploy.yml/badge.svg)](https://github.com/ttsukagoshi/sheetsL/actions/workflows/deploy.yml)
 
-Google Sheets addon to use DeepL translation. Translate the contents of the selected range and paste them in the range of cells adjacent to the original range.
+Google Sheets add-on to use DeepL translation. Translate the contents of the selected range and paste them in the range of cells adjacent to the original range.
+
+![SheetsL icon](https://www.scriptable-assets.page/assets/images/sheetsl/SheetsL_Application%20Card%20Banner_220.png)
+
+## How to Use
+
+Details of the add-on is described in the [app's web page](https://www.scriptable-assets.page/add-ons/sheetsl/).
+
+## Terms and Conditions
+
+You must agree to the [Terms and Conditions](https://www.scriptable-assets.page/terms-and-conditions/) (TaC) to use this add-on. [The disclosure on privacy and OAuth scopes](https://www.scriptable-assets.page/add-ons/sheetsl/#disclosure-on-privacy-and-oauth-scopes) constitutes part of this TaC.
 
 ## Attributes