[#1838] Added content for fetch and XMLHttpRequest. (#2503)

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/106-javascript/content/118-working-with-apis/100-xml-http-request.md

@@ -5,3 +5,4 @@
 <ResourceGroupTitle>Free Content</ResourceGroupTitle>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest'>Using XMLHttpRequest</BadgeLink>
 <BadgeLink colorScheme='green' badgeText='Course' href='https://javascript.info/xmlhttprequest'>Network request - XMLHttpRequest</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.w3schools.com/xml/xml_http.asp'>W3Schools</BadgeLink>

content/roadmaps/106-javascript/content/118-working-with-apis/101-fetch.md

@@ -7,3 +7,4 @@ Fetch or Fetch API is a modern alternative to XMLHttpRequest. Compared to XMLHtt
 <BadgeLink colorScheme='green' badgeText='Course' href='https://javascript.info/fetch'>Network request - Fetch</BadgeLink>
 <BadgeLink badgeText='Read' colorScheme="yellow" href='https://www.w3schools.com/js/'>W3Schools – JavaScript Tutorial</BadgeLink>
 <BadgeLink badgeText='Read' colorScheme="yellow" href='https://www.codeguage.com/courses/js/'>A Comprehensive Course on JavaScript with Quizzes and Exercises - CodeGuage</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=cuEtnrL9-H0'>Learn Fetch API In 6 Minutes</BadgeLink>