Done the Introduction of CSS

closes #22

Front-End/CSS/Readme.md

@@ -1,3 +1,29 @@
 # CSS Tutorial
 
   Here we will learn everything about CSS, how to deal with it and Some tricks in writing it.
+
+## Agenda
+
+- [What is CSS?](https://github.com/nadamedhat27/Full-Stack/tree/main/Front-End/CSS#what-is-CSS)
+
+
+----------------------------------------------------------------
+
+- ## What is CSS?
+
+  - A short for Cascade Style Sheet.
+  - Language to create the presentation and visuals (Fonts, Colors, Margins, Images, etc.).
+  - Levels: 1, 2, 3.
+
+
+----------------------------------------------------------------
+
+- ## Why CSS?
+
+  If you are looking for working as Web Designer, UI Developer or Front-End Developer then you well need CSS as a background before you get in deep with the previous job titles.
+
+----------------------------------------------------------------
+
+- ## Prerequisites
+
+  Learn HTML, CSS is used to style the HTML structure you wrote before so, you should learn how to deal with HTML before you learn CSS.