Afegir sessió 4 del lab de fenomens

Change-Id: I68a9c725acd6cde3fd43413fe673e5ec7794f7e6
diff --git a/quad10/fenomens/lab/p4/.gitignore b/quad10/fenomens/lab/p4/.gitignore
new file mode 100644
index 0000000..a1a0b85
--- /dev/null
+++ b/quad10/fenomens/lab/p4/.gitignore
@@ -0,0 +1,2 @@
+mc2.dat
+data_out