chore: add recommended extensions for vscode

.vscode/extensions.json

@@ -0,0 +1,11 @@
+{
+    "recommendations": [
+        "ms-python.python",
+        "editorconfig.editorconfig",
+        "yzhang.markdown-all-in-one",
+        "esbenp.prettier-vscode",
+        "timonwong.shellcheck",
+        "foxundermoon.shell-format",
+        "redhat.vscode-yaml"
+    ]
+}