docs: add package import rule guide

website/catalog/go/match-package-import.md

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+## Match package import in Golang
+
+* [Playground Link](/playground.html#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)
+
+### Description
+
+A generic rule template for detecting imports of specific packages in Go source code. This rule can be customized to match any package by modifying the regex pattern, making it useful for security auditing, dependency management, and compliance checking.
+
+This rule identifies Go import statements based on the configured regex pattern, including:
+
+Direct imports: `import "package/name"`  
+Versioned imports: `import "package/name/v4"`  
+Subpackage imports: `import "package/name/subpkg"`  
+Grouped imports within `import () blocks` 
+
+### YAML
+
+```yaml
+id: match-package-import
+language: go
+rule:
+  kind: import_spec
+  has:
+    regex: PACKAGE_PATTERN_HERE
+``` 
+
+### Example
+
+JWT Library Detection
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/golang-jwt/jwt"  // This matches the AST rule
+)
+
+func main() {
+	// Create a new token
+	token := jwt.New(jwt.SigningMethodHS256)
+
+	// Add some claims
+	token.Claims = jwt.MapClaims{
+		"user": "alice",
+		"role": "admin",
+	}
+
+	// Sign the token
+	tokenString, err := token.SignedString([]byte("my-secret"))
+	if err != nil {
+		fmt.Printf("Error signing token: %v\n", err)
+		return
+	}
+
+	fmt.Printf("Generated token: %s\n", tokenString)
+}
+```
+
+### Contributed by
+
+[Sudesh Gutta](https://github.com/sudeshgutta)