feat: initial commit of cve-differential action

.gitignore

@@ -0,0 +1,15 @@
+# OS / Editor files
+.DS_Store
+*.swp
+*~
+.idea/
+.vscode/
+
+# Scanned artifacts / temp reports
+sboms/
+cve-reports/
+*.spdx.json
+cve-*.json
+cve-delta.md
+cve-summary.md
+node_modules/