Initialize encryption and JavaScript reverse-engineering study repository

Document the project structure and setup while excluding local dependencies and IDE settings.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -0,0 +1,11 @@
+{
+  "dependencies": {
+    "crypto-js": "^4.2.0",
+    "jsencrypt": "^3.5.4",
+    "node-rsa": "^2.0.0"
+  },
+  "devDependencies": {
+    "@types/crypto-js": "^4.2.2",
+    "@types/node": "^22.20.3"
+  }
+}