Update README.md

Add filters to graphql example

README.md

@@ -32,7 +32,21 @@ $entity->getRelation()->getField1()
 And see it realized in GraphQL with fine grained control over each field via hydrators:
 
 ```js
-{ entity { relation { field1 field2 manyToOne { name field3 } } otherRelation { field4 field5 } } }
+  { 
+    entity (filter: { id: 5 }) { 
+      relation { 
+        field1 
+        field2 
+        manyToOne (filter: { name_contains: 'dev' }) { 
+          name 
+          field3 
+        } 
+      } otherRelation { 
+        field4 
+        field5 
+      } 
+    } 
+  }
 ```