added content to databases in node.js roadmap (#2575)

* added content to read.md file of   110-nodejs-databases

(#1839 ) [https://github.com/kamranahmedse/developer-roadmap/issues/1839] I solved this issue by adding content. Please look at my PR!!

* Update content/roadmaps/107-nodejs/content/110-nodejs-databases/readme.md

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

content/roadmaps/107-nodejs/content/110-nodejs-databases/readme.md

@@ -1 +1,3 @@
-# Nodejs databases
+# What is Database
+
+A database is an organized collection of structured information, or data, typically stored electronically in a computer system. A database is usually controlled by a database management system (DBMS).