Update README

README.md

@@ -1,2 +1,143 @@
-# markdown
-markdown builder that includes to convert Markdown to HTML
+[![LinuxUnitTest](https://github.com/go-spectest/markdown/actions/workflows/linux_test.yml/badge.svg)](https://github.com/go-spectest/markdown/actions/workflows/linux_test.yml)
+[![MacUnitTest](https://github.com/go-spectest/markdown/actions/workflows/mac_test.yml/badge.svg)](https://github.com/go-spectest/markdown/actions/workflows/mac_test.yml)
+[![WindowsUnitTest](https://github.com/go-spectest/markdown/actions/workflows/windows_test.yml/badge.svg)](https://github.com/go-spectest/markdown/actions/workflows/windows_test.yml)
+[![reviewdog](https://github.com/go-spectest/markdown/actions/workflows/reviewdog.yml/badge.svg)](https://github.com/go-spectest/markdown/actions/workflows/reviewdog.yml)
+[![Gosec](https://github.com/go-spectest/markdown/actions/workflows/gosec.yml/badge.svg)](https://github.com/go-spectest/markdown/actions/workflows/gosec.yml)
+# What is markdown package
+The Package markdown is a simple markdown builder from Go code. This library assembles Markdown using method chaining, not uses a template engine like [html/template](https://pkg.go.dev/html/template). 
+
+This library was initially developed to display test results in [go-spectest/spectest](https://github.com/go-spectest/spectest). Therefore, it implements the features required by spectest, but there are no plans to add additional functionalities unless requested by someone.
+
+Additionally, complex code that increases the complexity of the library, such as generating nested lists, will not be added. I want to keep this library as simple as possible.
+
+## Supported OS and go version
+- OS: Linux, macOS, Windows
+- Go: 1.18 or later
+
+## Supported Markdown features
+- [x] Heading; H1, H2, H3, H4, H5, H6
+- [x] Blockquote 
+- [x] Bullet list
+- [x] Ordered list
+- [x] Checkbox list 
+- [x] Code blocks
+- [x] Horizontal rule 
+- [x] Table
+- [x] Text formatting; bold, italic, code, strikethrough, bold italic
+- [x] text with link
+- [x] text with image
+- [x] plain text
+- [x] details 
+
+## Example
+```go
+package main
+
+import (
+	"os"
+
+	"github.com/go-spectest/markdown"
+)
+
+func main() {
+	markdown.NewMarkdown(os.Stdout).
+		H1("This is H1").
+		PlainText("This is plain text").
+        LF().
+		H2f("This is %s with text format", "H2").
+		PlainTextf("Package markdown provides functions for text formatting, such as %s and %s, %s styles.",
+			markdown.Bold("bold"), markdown.Italic("italic"), markdown.Code("code")).
+        LF().
+		H2("Code Block").
+		CodeBlocks(markdown.SyntaxHighlightGo,
+			`package main
+import "fmt"
+
+func main() {
+	fmt.Println("Hello, World!")
+}`).
+        LF().
+		H2("List").
+		BulletList("Bullet Item 1", "Bullet Item 2", "Bullet Item 3").
+		OrderedList("Ordered Item 1", "Ordered Item 2", "Ordered Item 3").
+        LF().
+		H2("CheckBox").
+		CheckBox([]markdown.CheckBoxSet{
+			{Checked: false, Text: markdown.Code("sample code")},
+			{Checked: true, Text: markdown.Link("Go", "https://golang.org")},
+			{Checked: false, Text: markdown.Strikethrough("strikethrough")},
+		}).
+		H2("Blockquote").
+		Blockquote("Your time is limited, don't waste it living someone else's life.").
+        LF().
+		H3("Horizontal Rule").
+		HorizontalRule().
+        LF().
+		H2("Table").
+		Table(markdown.TableSet{
+			Header: []string{"Name", "Age", "Country"},
+			Rows: [][]string{
+				{"David", "23", "USA"},
+				{"John", "30", "UK"},
+				{"Bob", "25", "Canada"},
+			},
+		}).
+		H2("Image").
+		PlainTextf(markdown.Image("sample_image", "./sample.png")).
+		Build()
+}
+```
+
+Output:
+````
+# This is H1
+This is plain text
+  
+## This is H2 with text format
+Package markdown provides functions for text formatting, such as **bold** and *italic*, `code` styles.
+  
+## Code Block
+```go
+package main
+import "fmt"
+
+func main() {
+        fmt.Println("Hello, World!")
+}
+```
+  
+## List
+- Bullet Item 1
+- Bullet Item 2
+- Bullet Item 3
+1. Ordered Item 1
+2. Ordered Item 2
+3. Ordered Item 3
+  
+## CheckBox
+- [ ] `sample code`
+- [x] [Go](https://golang.org)
+- [ ] ~~strikethrough~~
+  
+## Blockquote
+> Your time is limited, don't waste it living someone else's life.
+  
+### Horizontal Rule
+---
+  
+## Table
+| NAME  | AGE | COUNTRY |
+|-------|-----|---------|
+| David |  23 | USA     |
+| John  |  30 | UK      |
+| Bob   |  25 | Canada  |
+
+## Image
+![sample_image](./sample.png)
+````
+
+If you want to see how it looks in Markdown, please refer to the following link.
+- [sample.md](./doc/generated_example.md)
+
+## License
+[MIT License](./LICENSE)