Update 01-introduction-and-history.md

Author: sajidhamdard

notes/English/01-introduction-and-history.md

@@ -14,7 +14,7 @@ A machine-level language, also known as low-level language, is a type of program
 
 ### What is front-end ?
 
-Front-end refers to the part of web development that deals with the user interface and the client-side of the application. It mainly focuses on the design and layout of the website and how it interacts with the user. This includes technologies such as HTML, CSS, and JavaScript, and frameworks such as React, Angular, and Vue.js. The goal of front-end development is to create a seamless and user-friendly experience for the website visitors.
+Front-end refers to the part of web development that deals with the user interface and the client-side of the application. It mainly focuses on the design and layout of the website and how it interacts with the user. This includes technologies such as HTML, CSS, and JavaScript, and frameworks/libraries such as React, Angular, and Vue.js. The goal of front-end development is to create a seamless and user-friendly experience for the website visitors.
 
 ### What is back-end ?
 
@@ -42,6 +42,10 @@ ECMA is the European Association for Standardizing Information and Communication
 
 The following are some of the most widely-used versions of ECMAScript:
 
+- ECMAScript 1 (release in 1997) - First edition
+
+- ECMAScript 2 (release in 1998) - Editorial changes
+
 - ECMAScript 3 (released in 1999) - This version introduced regular expressions, try-catch exception handling, and other features.
 
 - ECMAScript 5 (released in 2009) - This version added features such as strict mode, JSON support, and additional methods for arrays and objects.