Add extensions.json

Author: pmuens

.vscode/extensions.json

@@ -0,0 +1,9 @@
+{
+  "recommendations": [
+    "golang.go",
+    "ms-vscode.hexeditor",
+    "esbenp.prettier-vscode",
+    "editorconfig.editorconfig",
+    "streetsidesoftware.code-spell-checker"
+  ]
+}