SHA1 signature docs

Author: WyriHaximus

README.md

@@ -46,6 +46,24 @@ Signs request with `HMAC-MD5`. Usage:
 ```php
 <?php
 
+use ApiClients\Tools\Psr7\Oauth1\Definition;
+use ApiClients\Tools\Psr7\Oauth1\RequestSigning\RequestSigner;
+use ApiClients\Tools\Psr7\Oauth1\Signature\HmacMd5Signature;
+
+$requestSigner = new RequestSigner(
+    new Definition\ConsumerKey('consumer_key'),
+    new Definition\ConsumerSecret('consumer_secret'),
+    new HmacMd5Signature()
+);
+```
+
+## SHA1
+
+Signs request using `HMAC-SHA1`. Usage:
+
+```php
+<?php
+
 use ApiClients\Tools\Psr7\Oauth1\Definition;
 use ApiClients\Tools\Psr7\Oauth1\RequestSigning\RequestSigner;
 use ApiClients\Tools\Psr7\Oauth1\Signature\HmacSha1Signature;