Add continuum mechanics' P4 lab session

Change-Id: I15a80d28235451f82743b553044662dd66876764
diff --git a/quad8/continuummechanics/lab/.gitignore b/quad8/continuummechanics/lab/.gitignore
new file mode 100644
index 0000000..19d0629
--- /dev/null
+++ b/quad8/continuummechanics/lab/.gitignore
@@ -0,0 +1,2 @@
+# Don't include compiled PDFs
+*.pdf