Update docs/client.md

Author: robert-nogueira

docs/client.md

@@ -124,6 +124,23 @@ async def example():
     await client.delete_app_file(app_id='application_id', path='/file.txt')
 ```
 
+---
+
+### Squarecloud Statistics
+
+you can get the squarecloud statistics using `Client.statistics()`
+
+```python
+import squarecloud as square
+
+client = square.Client(api_key='API KEY')
+
+
+async def example():
+    statistics = await client.statistics()
+    print(statistics)  # StatisticsData(...)
+```
+
 ___
 
 ### Debug mode