add start of related work

chapters/chap01-introduction/chap01-introduction.tex

@@ -15,5 +15,11 @@
 
 \section{Related work   2}
 \label{sec:relatedWork}
+In \emph{Forecasting Epidemics Through Nonparametric Estimation of
+    Time-Dependent Transmission Rates Using the SEIR Model}~\cite{Smirnova2017},
+Smirnova \etal seek to find a stochastic method to estimate the time-dependend
+transmission rate $\beta(t)$, that on the contrary to earlier studies does not
+rely on parameters. They achieve this by projecting on a finite subspace, that
+is defined by Legendre polynomials.
 
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