feat: add author metadata to zebbern security skills (#8)

Added metadata block with author: zebbern and version: 1.1 to all 29 security skills originally from claude-code-guide repository:
- active-directory-attacks, api-fuzzing-bug-bounty, aws-penetration-testing
- broken-authentication, burp-suite-testing, cloud-penetration-testing
- ethical-hacking-methodology, file-path-traversal, html-injection-testing
- idor-testing, linux-privilege-escalation, linux-shell-scripting
- metasploit-framework, network-101, pentest-checklist, pentest-commands
- privilege-escalation-methods, red-team-tools, scanning-tools
- shodan-reconnaissance, smtp-penetration-testing, sql-injection-testing
- sqlmap-database-pentesting, ssh-penetration-testing, top-web-vulnerabilities
- windows-privilege-escalation, wireshark-analysis, wordpress-penetration-testing
- xss-html-injection

skills/idor-testing/SKILL.md

@@ -1,6 +1,9 @@
 ---
 name: IDOR Vulnerability Testing
 description: This skill should be used when the user asks to "test for insecure direct object references," "find IDOR vulnerabilities," "exploit broken access control," "enumerate user IDs or object references," or "bypass authorization to access other users' data." It provides comprehensive guidance for detecting, exploiting, and remediating IDOR vulnerabilities in web applications.
+metadata:
+  author: zebbern
+  version: "1.1"
 ---
 
 # IDOR Vulnerability Testing