update docs

README.rst

@@ -27,6 +27,21 @@ Server consists of two services:
 
   - grpclib_ + hiku_
 
+Installation
+~~~~~~~~~~~~
+
+To install client library for synchronous app:
+
+.. code-block:: shell
+
+    $ pip install featureflags-client grpcio
+
+To install client library for asynchronous app:
+
+.. code-block:: shell
+
+    $ pip install featureflags-client grpclib
+
 Development
 ~~~~~~~~~~~
 

client/featureflags/client/flags.py

@@ -225,3 +225,12 @@ def flags(
         finally:
             if tracer is not None:
                 self._manager.add_trace(tracer)
+
+    def preload(self, timeout=None):
+        """Preload flags from server.
+        This method syncs all flags with server"""
+        self._manager.preload(timeout=timeout, defaults=self._defaults)
+
+    async def preload_async(self, timeout=None):
+        """Async version of `preload` method"""
+        await self._manager.preload(timeout=timeout, defaults=self._defaults)