Add VS Code extension recommendations for development setup

Author: jahnvi480

.vscode/extensions.json

@@ -0,0 +1,20 @@
+{
+    "recommendations": [
+        // Python extensions - Code formatting and linting
+        "ms-python.python",
+        "ms-python.vscode-pylance",
+        "ms-python.black-formatter",
+        "ms-python.autopep8",
+        "ms-python.pylint",
+        "ms-python.flake8",
+        // C++ extensions - Code formatting and linting
+        "ms-vscode.cpptools",
+        "ms-vscode.cpptools-extension-pack",
+        "xaver.clang-format",
+        "mine.cpplint",
+    ],
+    "unwantedRecommendations": [
+        // Avoid conflicts with multiple formatters
+        "ms-vscode.cpptools-themes"
+    ]
+}