Добавление документации

docs/source/usage.rst

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+Использование
+=============
+
+.. code-block:: python
+
+   from jsonrpc import JSONRPC
+
+
+   jsonrpc = JSONRPC()
+
+   @jsonrpc.method('app.endpoint')
+   def app_endpoint(a: int, b: int) -> int:
+       result = a + b
+       return result
+
+   request = {
+       "jsonrpc": "2.0",
+       "method": "app.endpoint",
+       "params": {"a": 1, "b": 2},
+       "id": "1"
+   }
+   response = jsonrpc(request)
+
+   print(response)