feat: added LessThanOrEqual rule documentation

Author: andrepimpao

docs/03-rules-greater-than-or-equal.md

@@ -1,6 +1,7 @@
 # GreaterThanOrEqual
 
-Validates that a value is greater than or equal to another value. Can compare between strings, numbers and dates.
+Validates that a value is greater than or equal to another value. 
+Can compare between strings, numbers and dates.
 
 ## Basic Usage
 
@@ -28,7 +29,8 @@ Validator::greaterThan(new DateTime('today'))->validate(new DateTime('today'));
 
 type: `mixed` `required`
 
-It defines the comparison/minimum value. Can be a `string`, `int`, `float` or `DateTimeInterface` object.
+It defines the comparison/minimum value. 
+Can be a `string`, `int`, `float` or `DateTimeInterface` object.
 
 ### `message`
 

docs/03-rules-greater-than.md

@@ -1,6 +1,7 @@
 # GreaterThan
 
-Validates that a value is greater than another value. Can compare between strings, numbers and dates.
+Validates that a value is greater than another value. 
+Can compare between strings, numbers and dates.
 
 ## Basic Usage
 
@@ -24,7 +25,8 @@ Validator::greaterThan(new DateTime('today'))->validate(new DateTime('tomorrow')
 
 type: `mixed` `required`
 
-It defines the comparison/minimum value. Can be a `string`, `int`, `float` or `DateTimeInterface` object.
+It defines the comparison/minimum value. 
+Can be a `string`, `int`, `float` or `DateTimeInterface` object.
 
 ### `message`
 

docs/03-rules-less-than-or-equal.md

@@ -0,0 +1,48 @@
+# LessThanOrEqual
+
+Validates that a value is less than or equal to another value. 
+Can compare between strings, numbers and dates.
+
+## Basic Usage
+
+```php
+Validator::greaterThan(20)->validate(10); // true
+Validator::greaterThan(10)->validate(10); // true
+Validator::greaterThan(2.5)->validate(1.5); // true
+Validator::greaterThan(1.5)->validate(1.5); // true
+Validator::greaterThan('beta')->validate('alpha'); // true
+Validator::greaterThan('alpha')->validate('alpha'); // true
+Validator::greaterThan(new DateTime('today'))->validate(new DateTime('yesterday')); // true
+Validator::greaterThan(new DateTime('today'))->validate(new DateTime('today')); // true
+```
+
+> **Note**
+> String comparison is case-sensitive, meaning that comparing `'hello'` with `'Hello'` is different.
+> Check [`strcmp`](https://www.php.net/manual/en/function.strcmp.php) for more information.
+
+> **Note**
+> An `UnexpectedValueException` will be thrown when trying to compare incomparable values, like a `string` with an `int`.
+
+## Options
+
+### `constraint`
+
+type: `mixed` `required`
+
+It defines the comparison/maximum value. 
+Can be a `string`, `int`, `float` or `DateTimeInterface` object.
+
+### `message`
+
+type: `string` default: `The "{{ name }}" value should be less than or equal to "{{ constraint }}", "{{ value }}" given.`
+
+Message that will be shown if the value is not less than or equal to the constraint value.
+Check the [Custom Messages]() section for more information.
+
+The following parameters are available:
+
+| Parameter          | Description                       |
+|--------------------|-----------------------------------|
+| `{{ value }}`      | The current invalid value         |
+| `{{ name }}`       | Name of the value being validated |
+| `{{ constraint }}` | The comparison value              |

docs/03-rules-less-than.md

@@ -1,6 +1,7 @@
 # LessThan
 
-Validates that a value is less than another value. Can compare between strings, numbers and dates.
+Validates that a value is less than another value. 
+Can compare between strings, numbers and dates.
 
 ## Basic Usage
 
@@ -24,7 +25,8 @@ Validator::greaterThan(new DateTime('today'))->validate(new DateTime('yesterday'
 
 type: `mixed` `required`
 
-It defines the comparison/maximum value. Can be a `string`, `int`, `float` or `DateTimeInterface` object.
+It defines the comparison/maximum value. 
+Can be a `string`, `int`, `float` or `DateTimeInterface` object.
 
 ### `message`