Update introduction in README

Author: SimplyDanny

.swiftlint.yml

@@ -5,6 +5,7 @@ included:
   - Tests
   - Package.swift
 excluded:
+  - assets
   - Tests/BuiltInRulesTests/Resources
   - Tests/FileSystemAccessTests/Resources
 

README.md

@@ -6,10 +6,9 @@ SwiftLint enforces the style guide rules that are generally accepted by the
 Swift community. These rules are well described in popular style guides like
 [Kodeco's Swift Style Guide](https://github.com/kodecocodes/swift-style-guide).
 
-SwiftLint hooks into [Clang](http://clang.llvm.org) and
-[SourceKit](http://www.jpsim.com/uncovering-sourcekit) to use the
-[AST](http://clang.llvm.org/docs/IntroductionToTheClangAST.html) representation
-of your source files for more accurate results.
+SwiftLint rules are predominantly based on [SwiftSyntax](https://github.com/swiftlang/swift-syntax).
+Some rules still hook into [Clang](http://clang.llvm.org) and
+[SourceKit](http://www.jpsim.com/uncovering-sourcekit) to access type information.
 
 [![Supported Swift Versions](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Frealm%2FSwiftLint%2Fbadge%3Ftype%3Dswift-versions)](https://swiftpackageindex.com/realm/SwiftLint)
 [![Supported Platforms](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Frealm%2FSwiftLint%2Fbadge%3Ftype%3Dplatforms)](https://swiftpackageindex.com/realm/SwiftLint)
@@ -22,7 +21,7 @@ This project adheres to the
 By participating, you are expected to uphold this code.
 
 > Switch Language:
-> [中文](https://github.com/realm/SwiftLint/blob/main/README_CN.md)
+> [中文](https://github.com/realm/SwiftLint/blob/main/README_CN.md),
 > [한국어](https://github.com/realm/SwiftLint/blob/main/README_KR.md)
 
 ## Video Introduction

assets/ScreenshotExample.swift

@@ -0,0 +1,21 @@
+import Foundation
+
+class MyViewController : UIViewController {  // space before colon
+    var userName:String = ""  // no space after colon; redundant type
+    let x = 5  // short variable name
+
+    func doSomething(arg: Int) {  // unused parameter
+        let result = userName as! String  // force cast
+
+        if(result.count > 0) {  // control statement parentheses; use !isEmpty
+            print("User name is not empty")
+        }
+
+        // try! someRiskyOperation()  // SwiftLint is syntax-aware -> no violation here
+        try! someRiskyOperation()  // force try
+    }
+
+    func someRiskyOperation() async throws { // unnecessary async; unnecessary throws
+        // Implementation
+    }
+}