Add .vscode/settings.json & extensions.json files to project (#3245)

.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+  "recommendations": [
+    "dbaeumer.vscode-eslint",
+    "editorconfig.editorconfig",
+    "esbenp.prettier-vscode",
+    "streetsidesoftware.code-spell-checker"
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,15 @@
+{
+  "[javascript][typescript][json][jsonc][markdown][yaml]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true
+  },
+  "[javascript][typescript]": {
+    "editor.codeActionsOnSave": {
+      "source.fixAll.eslint": "explicit"
+    }
+  },
+  "eslint.validate": ["javascript", "typescript"],
+  "editor.formatOnSave": true,
+  "editor.renderWhitespace": "all",
+  "files.trimTrailingWhitespace": true
+}