Create README.md

Author: wivern-co-uk

README.md

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+# PHP SDK for the Webflow CMS API
+Implementation based on [Webflow CMS API Reference](https://developers.webflow.com/#cms-api-reference)
+
+## Features implemented
+- Get Current Authorization Info
+- List Sites
+- Get Specific Site
+- Publish Site
+- List Domains
+- List Collections
+- Get Collection with Full Schema
+- **Get All Items for a Collection (including paginated results)**
+- **Find one or Create Item by Name**
+- Get Single Item
+- Create New Collection Item
+- Update Collection Item
+- Patch Collection Item
+- Remove Collection Item
+
+## Usage
+
+Check https://university.webflow.com/article/using-the-webflow-cms-api on how to generate `YOUR_WEBFLOW_API_TOKEN`
+
+### Get Current Authorization Info
+```
+$webflow = new \Webflow\Api('YOUR_WEBFLOW_API_TOKEN');
+$webflow->info();
+```
+
+### List Sites
+```
+$webflow->sites();
+```
+
+### List Collections
+```
+$webflow->collections();
+```
+
+### Get All Items for a Collection (including paginated results)
+```
+$webflow->itemsAll($collectionId);
+```
+### Get Single Item
+```
+$webflow->item($collectionId, $itemId);
+```
+
+### Create New Collection Item
+```
+$fields = [
+    'name' => 'New item created via API',
+    # ...
+];
+$webflow->createItem($collectionId, $fields);
+```
+
+### Update Collection Item
+```
+$webflow->updateItem($collectionId, $itemId, $fields);
+```
+
+### Remove Collection Item
+```
+$webflow->removeItem($collectionId, $itemId);
+```
+
+
+## Installation
+
+```
+# Install Composer
+composer require expertlead/webflow-php-sdk
+```
+No extra dependencies! You are welcome ;)
+