Add .vscode settings to the repo (#16648)

Adding some .vscode settings to help with automatic relative imports, and a suggested default formatter extension of "Prettier ESLint"

.gitignore

@@ -12,7 +12,6 @@ package
 
 # IDEs
 .idea
-.vscode
 .sublime-project
 
 *.bak

.prettierignore

@@ -8,7 +8,6 @@ jest-coverage/
 storybook-build/
 app/vendor/**
 .nyc_output/**
-.vscode/**
 test/e2e/send-eth-with-private-key-test/**
 *.scss
 development/chromereload.js

.vscode/extensions.json

@@ -0,0 +1,3 @@
+{
+  "recommendations": ["rvest.vs-code-prettier-eslint"]
+}

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+  "editor.defaultFormatter": "rvest.vs-code-prettier-eslint",
+  "editor.tabSize": 2,
+  "files.trimTrailingWhitespace": true,
+  "javascript.preferences.importModuleSpecifier": "relative"
+}