feat: add support for 30+ languages and update README

- Add support for Rust, C#, PHP, Swift, Kotlin, SQL
- Add support for HTML, XML, CSS, SCSS markup languages
- Add support for JSX/TSX, Dart, Scala
- Add support for shell variants, config files, and more
- Add AlternateLineComment support for INI files
- Update README with comprehensive language tables
- Bump version to 0.2.1

internal/types/types.go

@@ -26,8 +26,9 @@ type CLI struct {
 }
 
 type Language struct {
-	LineComment  string
-	BlockComment *BlockComment
+	LineComment          string
+	AlternateLineComment string
+	BlockComment         *BlockComment
 }
 
 type BlockComment struct {