Add abstract

paper/termpaper.tex

@@ -37,6 +37,14 @@
 \maketitle
 
 \begin{abstract}
+    Participatory budgeting is a deliberative democratic process that allows
+    residents to decide how public funds should be spent. By combining a form of
+    preference elicitation with an aggregation method, a set of winning projects
+    is determined and funded. This paper first gives an introduction into
+    participatory budgeting methods and then focuses on approval-based models to
+    discuss algorithmic complexity. Furthermore, a short overview of useful
+    axioms that can help select one method in practice is presented. Finally, an
+    outlook on future challenges surrounding participatory budgeting is given.
 \end{abstract}
 
 \section{Introduction}