Create security vulnerability issue template

Add a template for reporting security vulnerabilities.

Author: anshumanjadiya1102

.github/ISSUE_TEMPLATE/security_vulnerability.md

@@ -0,0 +1,21 @@
+---
+name: 🔒 Security report
+about: Privately disclose a security issue in MyCMD
+title: "[SECURITY] "
+labels: ["security"]
+---
+
+⚠️ **Please do not disclose sensitive details publicly.**  
+If this issue is sensitive, email directly to: `security@driveforjava.dev`
+
+### 🧩 Description
+Describe the security issue briefly.
+
+### 🧪 Reproduction
+Steps or code snippet to reproduce (if safe).
+
+### 🔍 Impact
+Explain potential risk or exposure.
+
+### 🧠 Suggested fix
+Any ideas for mitigation or patch.