Added build files to turn the bible into a book

manuscript/chapter11.txt

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+# Traps
+
+Traps allow you to execute code on various signals. In `pxltrm` I'm using traps to redraw the user interface on window resize. Another use case is cleaning up temporary files on script exit.
+
+These `trap` lines should be added near the start of your script so any early errors are also caught.
+
+**NOTE:** For a full list of signals, see `trap -l`.
+
+
+## Do something on script exit
+
+```shell
+# Clear screen on script exit.
+trap 'printf \\e[2J\\e[H\\e[m' EXIT
+```
+
+## Ignore terminal interrupt (CTRL+C, SIGINT)
+
+```shell
+trap '' INT
+```
+
+## React to window resize.
+
+```shell
+# Call a function on window resize.
+trap 'code_here' SIGWINCH
+```
+
+## Do something before every command.
+
+```shell
+trap 'code_here' DEBUG
+```
+
+## Do something when a shell function or a sourced file finishes executing
+
+```shell
+trap 'code_here' RETURN
+```
+
+<!-- CHAPTER END -->
+