Suggest some useful editor extensions, including our spellchecker

This cofig is copied from the website repo.

Author: PeterJCLaw

.vscode/extensions.json

@@ -0,0 +1,20 @@
+{
+  // See https://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+  // Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+
+  // List of extensions which should be recommended for users of this workspace.
+  // Please keep the list alphabetically sorted within each group
+  "recommendations": [
+    "davidanson.vscode-markdownlint",
+    "editorconfig.editorconfig",
+    "streetsidesoftware.code-spell-checker",
+
+    // Generally useful tools which are useful here
+    "stkb.rewrap",
+    "wmaurer.change-case"
+  ],
+
+  // List of extensions recommended by VS Code that should not be recommended for users of this workspace.
+  "unwantedRecommendations": [
+  ]
+}