docs: bruch up readme.md

Author: zaq1tomo

README.md

@@ -1,37 +1,42 @@
 # notionapi
+
 [![GitHub tag (latest SemVer)](https://img.shields.io/github/v/tag/jomei/notionapi?label=go%20module)](https://github.com/jomei/notionapi/tags)
 [![Go Reference](https://pkg.go.dev/badge/github.com/jomei/notionapi.svg)](https://pkg.go.dev/github.com/jomei/notionapi)
 [![Test](https://github.com/jomei/notionapi/actions/workflows/test.yml/badge.svg)](https://github.com/jomei/notionapi/actions/workflows/test.yml)
 
-An API client for the [Notion API](https://developers.notion.com/) implemented in Golang
+This is a Golang implementation of an API client for the [Notion API](https://developers.notion.com/).
 
-# Supported APIs
-It supports all APIs for Notion API version `2022-06-28`
+## Supported APIs
 
-# Installation
+It supports all APIs of the Notion API version `2022-06-28`.
 
+## Installation
+
+```bash
+go get github.com/jomei/notionapi
 ```
-$ go get github.com/jomei/notionapi
-```
 
-# Getting started
-Follow Notion’s [getting started guide](https://developers.notion.com/docs/getting-started) to obtain an Integration Token.
+## Usage
+
+First, please follow the [Getting Started Guide](https://developers.notion.com/docs/getting-started) to obtain an integration token.
 
-## Example
+### Initialization
 
-Make a new `Client`
+Import this library and initialize the API client using the obtained integration token.
 
 ```go
 import "github.com/jomei/notionapi"
 
-
-client := notionapi.NewClient("your-integration-token")
+client := notionapi.NewClient("your_integration_token")
 ```
-Then, use client's methods to retrieve or update your content
+
+### Calling the API
+
+You can use the methods of the initialized client to call the Notion API. Here is an example of how to retrieve a page:
 
 ```go
-page, err := client.Page.Get(context.Background(), "your-page-id")
+page, err := client.Page.Get(context.Background(), "your_page_id")
 if err != nil {
-// do something
+ // Handle the error
 }
 ```