Add EFFECTS Slide (horizontal)

EFFECTS-Slide-%28horizontal%29.md

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+* [`slideIn`](#usage-slideIn) | [`slideOut`](#usage-slideOut) | [`slideToggle`](#usage-slideToggle)
+
+---
+
+## <a id="usage-slideIn"></a>.slideIn
+
+**Description**
+Displays the matched elements with a sliding motion (usually from left to right or by expanding width).
+
+**Parameters**
+* `options` (Object, optional): Animation options.
+  * `duration` (Number): Duration in milliseconds (default is 300).
+  * `direction` (String): 'left' or 'right' (default is 'left').
+  * `easing` (String): CSS transition timing function (default is 'cubic-bezier(0.4, 0.0, 0.2, 1)').
+  * `bounce` (Boolean): If set to true, applies a dynamic spring-like curve that slightly overshoots the target before resting.
+
+**Returns**
+* (jBase): Current instance.
+
+**Example**
+
+```javascript
+$('#sidebar').slideIn({ duration: 400, direction: 'left' });
+
+// 1. Shorthand syntax (Number)
+$('#sidebar').slideIn(400);
+
+// 2. Slide in from the right with custom easing
+$('#sidebar').slideIn({ 
+    duration: 500, 
+    direction: 'right', 
+    easing: 'linear' 
+});
+
+// 3. The new snappy bounce effect
+$('#drawer').slideIn({ 
+    duration: 600, 
+    bounce: true 
+});
+```
+
+---
+
+## <a id="usage-slideOut"></a>.slideOut
+
+**Description**
+Hides the matched elements with a sliding motion (usually collapsing width or moving off-canvas).
+
+**Parameters**
+* `options` (Object, optional): Animation options.
+  * `duration` (Number): Duration in milliseconds (default is 300).
+  * `direction` (String): 'left' or 'right' (default is 'left').
+  * `easing` (String): CSS transition timing function.
+  * `bounce` (Boolean): If set to true, the element slightly pulls back before shooting off-canvas.
+
+**Returns**
+* (jBase): Current instance.
+
+**Example**
+
+```javascript
+$('#sidebar').slideOut({ duration: 400 });
+
+// 1. Shorthand syntax (Number)
+$('#sidebar').slideOut(400);
+
+// 2. Slide out to the right with bounce effect
+$('#sidebar').slideOut({ 
+    duration: 500, 
+    direction: 'right', 
+    bounce: true 
+});
+
+```
+
+---
+
+## <a id="usage-slideToggle"></a>.slideToggle
+
+**Description**
+Display or hide the matched elements with a horizontal sliding motion.
+
+**Parameters**
+* `options` (Object | Number, optional): Animation options object, or a number representing the duration in milliseconds. Passes these options to either `slideIn` or `slideOut`.
+
+**Returns**
+* (jBase): Current instance.
+
+**Example**
+
+```javascript
+$('.drawer').slideToggle();
+
+// Toggle an off-canvas menu with a bouncy spring effect
+$('.menu-toggle-btn').on('click', () => {
+    $('.drawer').slideToggle({ 
+        duration: 400, 
+        bounce: true 
+    });
+});
+```