Create basic-syntax.md

Author: AmrutaJayanti

docs/CSS/css-basics/basic-syntax.md

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+## Basic Syntax
+
+CSS (Cascading Style Sheets) follows a simple syntax for styling HTML elements. Each CSS rule consists of a selector, followed by a set of declarations enclosed in curly braces.
+
+Example CSS rule:
+
+```css
+selector {
+    property: value;
+}