Updated the readme file for adding flush all method reference and setting the rache driver env.

Author: Kumaravel

README.md

@@ -47,6 +47,19 @@ You can either declare the default middleware, or you extend it by creating your
 'rache' => \Rache\Middleware\CacheResponse::class,
 ```
 
+### Setting the Driver
+
+Make sure to set the rache driver in the <b>.env</b> file with the corresponding driver name which you want to use.
+
+```
+RACHE_DRIVER=redis // It uses laravel cache system behind the scenes.
+```
+
+#### Note
+
+Since rache uses Laravel Cache Tags behind the scenes it contains the same limitations as Laravel Cache tags. Cache tags
+aren't supported when using the `file`, `dynamodb`, or `database` cache drivers.
+
 ### Rache Tags
 
 Rache tags acts as label for settings up the cache against some data. `Auth`, `Request`, and `Pagination` tags are added
@@ -136,6 +149,14 @@ Route::get('/posts', 'PostController@index')
     ->name('posts.index');
 ```
 
+### Flush all the cached responses
+
+By calling the flushAll, you can clear all the cached response in the application.
+
+```injectablephp
+Rache::flushAll();
+```
+
 ### Flush the tags with route and data
 
 You can flush the cache by using `Rache::flushTag({tag-name}, {options:[route, data]})`. We can find some real-time
@@ -187,6 +208,7 @@ You can flush any type of tag along with route name or data based on your need.
 event or on custom event or an API trigger. You can use it anywhere, whenever a tag has been flushed it will clear all
 the corresponding cache.
 
+
 ## Credits
 
 - [Kumaravel](https://github.com/theriddleofenigma)