Added a simple description of DBus

Python/DBus/SDBus.md

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+---
+tags:
+  - Python
+  - DBus
+---
+
+Python-sdbus is, according to my experience, the most usable DBus-library for Python, because it is still getting updates, has a simple API and a good documentation.
+The only disatvantage is that you have to use asyncio to create a service.
+
+Project Github: https://github.com/python-sdbus/python-sdbus
+
+
+## What is DBus?
+The name comes from "Desktop Bus".
+The idea behind DBus is that you have a programing language independend standard for communication between different applications.
+DBus can be used to send signals to multiple applications, call methods in applications that were written in a different language or just to exchange data between processes.
+
+### How does DBus work?
+In DBus, you have buses, interfaces and paths.
+Bus names are similar to ip addresses, they consist of dot-separated characters and numbers, but every service/application can choose its own bus name.
+Interfaces are objects that contain methods, properties and signals. A bus can have multiple interfaces, because every interface has its own name. An interface name is similar to a bus name. It again consists of dot-separated characters and numbers.
+A path is a virtual path to a DBus-object. Every interface, for example, must have a path. 
+If you know the name of a service, (bus name) the interface name and the path, then you can interact with it.