updated README.md

README.md

@@ -2,4 +2,47 @@
 
 PHP Client for Vercel Blob Storage.
 
-[Vercel Blob](https://vercel.com/docs/storage/vercel-blob)
+[Vercel Blob](https://vercel.com/docs/storage/vercel-blob)
+
+## Usage
+
+### Creating Client
+
+```php
+$client = new \VercelBlobPhp\Client();
+```
+
+### Using Client
+
+#### PUT
+```php
+$result = $client->put(
+    'test.txt',   // path
+    'hello world' // content,
+    new \VercelBlobPhp\CommonCreateBlobOptions(
+        addRandomSuffix: true,      // optional
+        contentType: 'text',        // optional
+        cacheControlMaxAge: 123,    // optional
+    )
+);
+
+// $result is instance of PutBlobResult
+$result->url
+$result->downloadUrl
+$result->pathname
+$result->contentType
+$result->contentDisposition
+```
+
+Third argument is optional.
+
+#### DEL
+```php
+$client->del(['test.txt']);
+```
+
+#### COPY
+
+#### HEAD
+
+#### LIST