Add an editor config file.

.editorconfig

@@ -0,0 +1,16 @@
+# see https://editorconfig.org/
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.{yml,yaml}]
+indent_size = 2

.vscode/extensions.json

@@ -1,8 +1,9 @@
 {
   "recommendations": [
-    "ms-python.vscode-pylance",
-    "ms-python.python",
-    "ms-python.debugpy",
-    "charliermarsh.ruff"
+      "ms-python.vscode-pylance",
+      "ms-python.python",
+      "ms-python.debugpy",
+      "charliermarsh.ruff",
+      "editorconfig.editorconfig"
   ]
 }