Add continuum mechanics' P3 lab session

Change-Id: I29a8126a9b00d4c83696d06a2eb147ac5379d4a6
diff --git a/quad8/continuummechanics/lab/p3/datafit.dat b/quad8/continuummechanics/lab/p3/datafit.dat
new file mode 100644
index 0000000..e120d6f
--- /dev/null
+++ b/quad8/continuummechanics/lab/p3/datafit.dat
@@ -0,0 +1,9 @@
+0.00	0.000	0.0716	0.0008
+0.05	0.001	0.0420	0.0007
+0.10	0.002	0.0337	0.0006
+0.15	0.002	0.0305	0.0006
+0.20	0.003	0.0282	0.0007
+0.80	0.021	0.0133	0.0005
+0.52	0.011	0.0182	0.0006
+0.40	0.007	0.0208	0.0007
+0.30	0.005	0.0229	0.0006