add introduction

thesis/content/02-background.tex

@@ -1,7 +1,6 @@
 \chapter{Background}
 \label{ch:background}
-
-% introduction
+This chapter provides explanations and background information on relevant technologies for a better understanding of this work. This includes the characteristics of different software system architectures and their separation into centralized, decentralized and distributed structures. The basic concepts of \ac{P2P} networks are also described. Furthermore, the main concepts of \acp{dApp} and their special features are explained.
 
 \section{Software System Architecture}
 \label{sec:application-architecture}