Add script to extract metadata of cve templates to json

For nuclei cve linker extension

usage : 
go run yaml2json.go ~/nuclei-templates/cves/ cves.json

.github/scripts/yaml2json.go

@@ -0,0 +1,92 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Classification struct {
+	CVSSScore string `yaml:"cvss-score,omitempty"`
+}
+
+type Info struct {
+	Name        string         `yaml:"name"`
+	Severity    string         `yaml:"severity"`
+	Description string         `yaml:"description"`
+	Classification Classification `yaml:"classification,omitempty"`
+}
+
+type Data struct {
+	ID          string `yaml:"id"`
+	Info        Info   `yaml:"info"`
+	FilePath    string `json:"file_path"`
+}
+
+func main() {
+	if len(os.Args) != 3 {
+		fmt.Println("Usage: go run main.go <directory> <output_file>")
+		os.Exit(1)
+	}
+
+	directory := os.Args[1]
+	outputFile := os.Args[2]
+
+	var data []Data
+
+	err := filepath.Walk(directory, func(path string, info os.FileInfo, err error) error {
+		if strings.HasSuffix(path, ".yaml") || strings.HasSuffix(path, ".yml") {
+			yamlFile, err := ioutil.ReadFile(path)
+                if err != nil {
+                    fmt.Printf("Error reading YAML file %s: %v\n", path, err)
+                    return err
+                }
+    
+                var d Data
+                err = yaml.Unmarshal(yamlFile, &d)
+                if err != nil {
+                    fmt.Printf("Error unmarshalling YAML file %s: %v\n", path, err)
+                    return err
+                }
+                if d.Info.Classification.CVSSScore == "" {
+                    d.Info.Classification.CVSSScore = "N/A"
+                }
+                if d.Info.Classification == (Classification{}) {
+                    d.Info.Classification.CVSSScore = "N/A"
+                }
+                d.FilePath = path
+    
+                data = append(data, d)
+            }
+            return nil
+        })
+    
+        if err != nil {
+            fmt.Printf("Error reading directory: %v\n", err)
+            os.Exit(1)
+        }
+    
+        var jsonData []byte
+        for _, d := range data {
+            temp, err := json.Marshal(d)
+            if err != nil {
+                fmt.Printf("Error marshalling JSON: %v\n", err)
+                os.Exit(1)
+            }
+            jsonData = append(jsonData, temp...)
+            jsonData = append(jsonData, byte('\n'))
+        }
+        err = ioutil.WriteFile(outputFile, jsonData, 0644)
+        if err != nil {
+            fmt.Printf("Error writing JSON data to file: %v\n", err)
+            os.Exit(1)
+        }
+    
+        fmt.Println("JSON data written to", outputFile)
+    }
+