Added readme

README.md

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+# PHP-Discord-Webhook
+A PHP library that makes sending Discord webhooks easier.
+
+## Installation
+```sh
+composer require axl1232/php-discord-webhook
+```
+
+## Usage
+Sending a text message
+```php
+$message = (new Axl1232\PhpDiscordWebhook\Message())
+    ->setContent('Hello world')
+    ->setUsername('Test hook')
+    ->setAvatarUrl('https://example.com/avatar.png');
+
+$hook = new Axl1232\PhpDiscordWebhook\Webhook('https://discordapp.com/api/webhooks/test/hook');
+$hook->send($message);
+```
+
+Sending a text message with attachment
+```php
+$message = (new Axl1232\PhpDiscordWebhook\Message())
+    ->setContent('Hello world')
+    ->setUsername('Test hook')
+    ->setAvatarUrl('https://example.com/avatar.png')
+    ->setFile('/path/to/file.png');
+
+$hook = new Axl1232\PhpDiscordWebhook\Webhook('https://discordapp.com/api/webhooks/test/hook');
+$hook->send($message);
+```
+
+Sending an embed message
+```php
+$message = (new Axl1232\PhpDiscordWebhook\Message())
+    ->setContent('Hello world')
+    ->setUsername('Test hook')
+    ->setAvatarUrl('https://example.com/avatar.png')
+    ->addEmbed(
+        (new Axl1232\PhpDiscordWebhook\Embed())
+        ->setTitle('Test embed')
+        ->setUrl('https://example.com/')
+        ->setDescription('Some embed description')
+        ->setImage(
+            (new Axl1232\PhpDiscordWebhook\Embed\Image())
+            ->setUrl('https://example.com/image.jpg')
+        )
+        ->setAuthor(
+            (new Axl1232\PhpDiscordWebhook\Embed\Author())
+            ->setName('Author')
+            ->setUrl('https://example.com')
+            ->setIconUrl('https://example.com/author_icon.png')
+        )
+        ->setColor(Axl1232\PhpDiscordWebhook\Tools\ColorHelper::FUSCHIA)
+        ->setFooter(
+            (new Axl1232\PhpDiscordWebhook\Embed\Footer())
+            ->setText('Footer text')
+            ->setIconUrl('https://example.com/footer_icon.png')
+        )
+        ->setTimestamp(new DateTime('-1 week'))
+        ->setThumbnail(
+            (new Axl1232\PhpDiscordWebhook\Embed\Thumbnail())
+            ->setUrl('https://example.com/thumbnail.png')
+        )
+        ->addField(
+            (new Axl1232\PhpDiscordWebhook\Embed\Field())
+            ->setName('Field 1')
+            ->setValue('Value 1')
+        )
+        ->addField(
+            (new Axl1232\PhpDiscordWebhook\Embed\Field())
+            ->setName('Field 2')
+            ->setValue('Value 2')
+        )
+    );
+
+$hook = new Axl1232\PhpDiscordWebhook\Webhook('https://discordapp.com/api/webhooks/test/hook');
+$hook->send($message);
+```
+
+Predefined colors in `Axl1232\PhpDiscordWebhook\Tools\ColorHelper`
+
+Name                 | Value     | Hex Code
+---------------------|-----------|-----------
+`WHITE`              | 16777215  | `#FFFFFF`
+`BLURPLE`            | 5793266   | `#5865F2`
+`GREYPLE` (Default)  | 10070709  | `#99AAB5`
+`DARK_BUT_NOT_BLACK` | 2895667   | `#2C2F33`
+`NOT_QUITE_BLACK`    | 2303786   | `#23272A`
+`GREEN`              | 5763719   | `#57F287`
+`YELLOW`             | 16705372  | `#FEE75C`
+`FUSCHIA`            | 15418782  | `#EB459E`
+`RED`                | 15548997  | `#ED4245`
+`WHITE`              | 16777215  | `#FFFFFF`
+`BLACK`              | 2303786   | `#23272A`