Updated README with requirements and installation instructions

Author: igo95862

README.md

@@ -5,6 +5,16 @@ Supports both asyncio (under `sdbus_async.networkmanager` module) and blocking (
 
 Implements most NetworkManager dbus interfaces and objects.
 
+## Requirements
+
+* `python-sdbus` version higher than 0.8rc2
+
+See [python-sdbus requirements](https://github.com/igo95862/python-sdbus#requirements).
+
+## Installation
+
+`pip install --only-binary ':all:' sdbus`
+
 # [Documentation](https://python-sdbus-networkmanager.readthedocs.io/en/latest/)
 
 This is the sub-project of [python-sdbus](https://github.com/igo95862/python-sdbus).