updating week4 material

CodeExamples/Week4/PromisesAndReactIntro/JSDOMExample.html

CodeExamples/Week4/PromisesAndReactIntro/asyncReview.html

...xamples/Week4/PromisesAndReactIntro/chainingPromises.html

CodeExamples/Week4/PromisesAndReactIntro/domExample.css

...es/Week4/PromisesAndReactIntro/first-react-app/.gitignore

...les/Week4/PromisesAndReactIntro/first-react-app/README.md

...4/PromisesAndReactIntro/first-react-app/package-lock.json

.../Week4/PromisesAndReactIntro/first-react-app/package.json

.../PromisesAndReactIntro/first-react-app/public/favicon.ico

...4/PromisesAndReactIntro/first-react-app/public/index.html

.../PromisesAndReactIntro/first-react-app/public/logo192.png

.../PromisesAndReactIntro/first-react-app/public/logo512.png

...romisesAndReactIntro/first-react-app/public/manifest.json

...4/PromisesAndReactIntro/first-react-app/public/robots.txt

...s/Week4/PromisesAndReactIntro/first-react-app/src/App.css

...es/Week4/PromisesAndReactIntro/first-react-app/src/App.js

...ek4/PromisesAndReactIntro/first-react-app/src/App.test.js

...Week4/PromisesAndReactIntro/first-react-app/src/index.css

.../Week4/PromisesAndReactIntro/first-react-app/src/index.js

.../Week4/PromisesAndReactIntro/first-react-app/src/logo.svg