Add content for backend automation (#2578)

* added content to readme.md file of  102-backend-automation

(#1840 ) [https://github.com/kamranahmedse/developer-roadmap/issues/1840] I solved this issue, Please look at my PR!!

* Update content/roadmaps/113-qa/content/103-qa-automated-testing/102-backend-automation/readme.md

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

content/roadmaps/113-qa/content/103-qa-automated-testing/102-backend-automation/readme.md

@@ -1 +1,7 @@
-# Backend automation
+# Backend Automation
+
+Backend Testing is a testing method that checks the server side or database of web applications or software. Backend testing aims to test the application layer or database layer to ensure that the web application or software is free from database defects like deadlock, data corruption, or data loss.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://testinggenez.com/what-is-backend-testing-and-types/'>What is backend testing?</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.guru99.com/what-is-backend-testing.html'>Backend Testing Tutorial</BadgeLink>