Adding skewX() entry (#8241)

* Add skewX entry

Added skewX entry with its documentation

* Add image for the code examples

Added images to media folder and use them to show the output of the code examples

* Revise skewX() documentation for accuracy

Updated the skewX documentation to improve clarity and correctness, including syntax and examples.

* Fix formatting of skewX value description

* Clean up skewX.md by removing redundant text

Removed unnecessary text before the CSS example.

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Author: Yidnekachew-SK

content/css/concepts/transform-functions/terms/skewX/skewX.md

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+---
+Title: 'skewX()'
+Description: 'Skews an element horizontally by a specified angle using the CSS transform property.'
+Subjects:
+  - 'Web Design'
+  - 'Web Development'
+Tags:
+  - 'Functions'
+  - 'Positioning'
+CatalogContent:
+  - 'learn-css'
+  - 'paths/front-end-engineer-career-path'
+---
+
+**`skewX()`** is a CSS transform function that skews an element along the x-axis by the specified angle. It distorts the element horizontally, shifting its top and bottom edges left or right while preserving its vertical orientation.
+
+## Syntax
+
+```pseudo
+transform: skewX(<value>);
+```
+
+**Parameters:**
+
+- `<angle>`: Specifies the skew amount. Accepts any valid CSS angle unit:
+  - Degrees (`deg`)
+  - Radians (`rad`)
+  - Gradians (`grad`)
+  - Turns (`turn`)
+
+The value may be positive or negative.
+
+**Return value:**
+
+None. This function produces a transform value that modifies the element’s rendering when applied through the `transform` property.
+
+## Example 1: Skewing by Degrees
+
+In this example, the element is skewed horizontally by 30deg:
+
+```css
+.box {
+  width: 50px;
+  height: 60px;
+  background-color: red;
+  transform: skewX(30deg);
+}
+```
+
+The output of the code above is shown below:
+
+![A box element skewed 30 degrees along the x-axis by CSS skewX function](https://raw.githubusercontent.com/Codecademy/docs/main/media/css-transform-skewX-1.jpg)
+
+## Example 2: Skewing by Turns
+
+In this example, the element is skewed horizontally by `-0.2turn`:
+
+```css
+.box {
+  width: 50px;
+  height: 60px;
+  background-color: red;
+  transform: skewX(-0.2turn);
+}
+```
+
+The output of the code above is shown below:
+
+![A box element skewed -0.2 turns along the x-axis by CSS skewX function](https://raw.githubusercontent.com/Codecademy/docs/main/media/css-transform-skewX-2.jpg)