Add string find validations

Author: wazabii8

Inp.php

@@ -492,6 +492,39 @@ public function equal($str): bool
         return ($this->value === $str);
     }
 
+    /**
+     * Checks if a string contains a given substring
+     *
+     * @param string $needle
+     * @return bool
+     */
+    public function contains(string $needle): bool
+    {
+        return str_contains($this->value, $needle);
+    }
+
+    /**
+     * Checks if a string starts with a given substring
+     *
+     * @param string $needle
+     * @return bool
+     */
+    public function startsWith(string $needle): bool
+    {
+        return str_starts_with($this->value, $needle);
+    }
+
+    /**
+     * Checks if a string ends with a given substring
+     *
+     * @param string $needle
+     * @return bool
+     */
+    public function endsWith(string $needle): bool
+    {
+        return str_ends_with($this->value, $needle);
+    }
+
     /**
      * IF value equals to param
      * @param $str

README.md

@@ -57,6 +57,18 @@ Inp::value("Lorem ipsum dolor")->equal("Lorem ipsum dolor");
 ```php
 Inp::value("Lorem ipsum dolor")->notEqual("Lorem ipsum");
 ```
+- **Contains**:
+```php
+Inp::value("Lorem ipsum dolor")->contains("ipsum");
+```
+- **Starts with**:
+```php
+Inp::value("Lorem ipsum dolor")->startsWith("Lorem");
+```
+- **Ends with**:
+```php
+Inp::value("Lorem ipsum dolor")->endsWith("dolor");
+```
 
 ### Validate if it's a valid email
 ```php