feat(proposal) add description and reason for checklist manifesto in background

pub/proposal/proposal.tex

@@ -124,8 +124,12 @@
       on how the tests should be carried out. \\
 
     \multirow{2}{*}{\parbox{8em}{The Checklist Manifesto~\cite{manifesto}}}
-    & \textbf{Description:} Filler \\
-    & \textbf{Reason:} Filler \\
+    & \textbf{Description:} Insight into the steps of implementing
+    a checklist in medicine whilst learning about how checklists are
+    designed and used in industries such as aviation and construction. \\
+    & \textbf{Reason:} Checklist designer from Boeing is interviewed
+    where they go through the vital design choices to make them effective
+    and how they gain pilots' trust to use checklists. \\
 
     \bottomrule
 \end{tabularx}