Update readme.md (#287)

DBMS/Database Management System/readme.md

@@ -72,6 +72,7 @@ Here, is the list of some popular DBMS system:
 * LibreOffice Base
 * MariaDB
 * Microsoft SQL Server etc.
+* firebase
 
 Application of DBMS
 -------------------
@@ -102,6 +103,22 @@ It is used for the management of supply chain and for tracking production of ite
 * HR Management: 
 For information about employees, salaries, payroll, deduction, generation of paychecks, etc.
 
+* Railway Reservation System –
+In the rail route reservation framework, the information base is needed to store the record or information of ticket 
+appointments, status about train’s appearance, and flight. Additionally, if trains get late, individuals become acquainted 
+with it through the information base update. 
+
+Library Management System – ...
+
+Education Sector –
+
+Credit card exchanges –
+
+Social Media Sites –
+
+Broadcast communications –
+
+
 Types of DBMS
 -------------
 
@@ -173,4 +190,4 @@ Summary
 * DBMS is widely used in Banking, Airlines, Telecommunication, Finance and other industries
 * The main Four DBMS types are 1) Hierarchical 2) Network 3) Relational 4) Object-Oriented DBMS
 * DBMS serves as an efficient handler to balance the needs of multiple applications using the same data
-* Cost of Hardware and Software of a DBMS is quite high which increases the budget of your organization
+* Cost of Hardware and Software of a DBMS is quite high which increases the budget of your organization