adding Fetch and Promise material

...deExamples/Week4/JSObjectsFetchCode/AddingProperties.html

...eCodeExamples/Week4/JSObjectsFetchCode/Destructuring.html

...es/Week4/JSObjectsFetchCode/FetchExamples/AsyncAwait.html

...Examples/Week4/JSObjectsFetchCode/FetchExamples/Cors.html

...eek4/JSObjectsFetchCode/FetchExamples/DisplayingCats.html

...Week4/JSObjectsFetchCode/FetchExamples/FetchingImage.html

...eek4/JSObjectsFetchCode/FetchExamples/PromisesFetch1.html

...eek4/JSObjectsFetchCode/FetchExamples/PromisesFetch2.html

...eek4/JSObjectsFetchCode/FetchExamples/PromisesFetch3.html

...eek4/JSObjectsFetchCode/FetchExamples/PromisesFetch4.html

...eek4/JSObjectsFetchCode/FetchExamples/PromisesFetch5.html

...eExamples/Week4/JSObjectsFetchCode/FetchExamples/tas.json

...ureCodeExamples/Week4/JSObjectsFetchCode/JSONExample.html

LectureCodeExamples/Week4/JSObjectsFetchCode/Objects.html

LectureSlides/Week4/JSObjectsFetch.pdf