[DOCS][Dev] Add HTTP Client

docs/developer/src/SUMMARY.md

@@ -13,7 +13,7 @@
 - [Queue](./queue.md)
 - [Attachments, Files and Thumbnails](./attachments.md)
 - [Security](./security.md)
-- [HTTP](./http.md)
+- [HTTP Client](./httpclient.md)
 - [Plugins](./plugins.md)
     - [Configuration](./plugins/configuration.md)
     - [Initialization and Clean Up](./plugins/lifetime.md)

docs/developer/src/httpclient.md

@@ -0,0 +1,11 @@
+# HTTP Client
+It is sometimes necessary to perform HTTP requests. We simply have a static wrapper
+around [Symfony HTTP](https://symfony.com/doc/current/http_client.html#basic-usage).
+
+You can do `App\Core\HTTPClient::{METHOD}(string: $url, array: $options): ResponseInterface`.
+The `$options` are elaborated in [Symfony Doc](https://symfony.com/doc/current/http_client.html#configuring-curlhttpclient-options).
+
+Please note that the HTTP Client is [lazy](https://en.wikipedia.org/wiki/Lazy_evaluation),
+which makes it very important to bear in mind [Network Errors](https://symfony.com/doc/current/http_client.html#dealing-with-network-errors),
+
+What you can take from Responses is specified [here](https://symfony.com/doc/current/http_client.html#processing-responses).