Add continuum mechanics' P4 lab session

Change-Id: I15a80d28235451f82743b553044662dd66876764
diff --git a/quad8/continuummechanics/lab/p4/.gitignore b/quad8/continuummechanics/lab/p4/.gitignore
new file mode 100644
index 0000000..53752db
--- /dev/null
+++ b/quad8/continuummechanics/lab/p4/.gitignore
@@ -0,0 +1 @@
+output