Add links in the appendix to the repos

tex/appendix.tex

 \chapter{Computing Pseudowalls Program}
 \label{appendix:tilt-rs}
 
+This appendix contains the source code of the \texttt{pseudo_tilt} program, to accompany
+Part \ref{part:fin-walls}, to compute solutions to Problem \ref{problem:problem-statement-2}
+(currently only for a principally polarised abelian surface).
+The code is hosted on GitLab at
+\url{https://gitlab.com/pseudowalls/tilt.rs}, the revision shown here is
+commit \href{https://gitlab.com/pseudowalls/tilt.rs/-/tree/6689d9a00a4378a45842340f49533970ade268ef}{6689d9a0}.
+The reader may find it more ergonomic to view the code via the
+\href{https://pseudowalls.gitlab.io/tilt.rs/pseudo_tilt}{online docs} (only available for latest version).
+
 \section{Library, Utils CLI Frontend}
 
 \rustlisting{../tilt.rs/src/}{main.tex}
@@ -34,6 +43,13 @@
 \rustlisting{../tilt.rs/src/}{tilt_stability/left_pseudo_semistabilizers/fixed_q_beta/fixed_r/bound_on_d.tex}
 
 \chapter{Pseudowalls Computer Algebra Library}
+This appendix contains the source code of the \texttt{pseudowalls} Python library, which is used throughout
+this thesis to make computations relating to stability conditions.
+The code is hosted on GitLab at
+\url{https://gitlab.com/pseudowalls/pseudowalls}, the revision shown here is
+commit \href{https://gitlab.com/pseudowalls/pseudowalls/-/tree/17e4163da4699e346d1e75353a68b1d1959fc43d}{17e4163}.
+The reader may find it useful to view the examples in the notebooks linked in the README for the repository to
+learn its usage.
 
 \pylisting{../pseudowalls/src/}{pseudowalls/integral_chern.tex}
 \pylisting{../pseudowalls/src/}{pseudowalls/chern_character.tex}