diff --git a/collabdemo b/collabdemo
new file mode 160000
index 0000000..73bf0b0
--- /dev/null
+++ b/collabdemo
@@ -0,0 +1 @@
+Subproject commit 73bf0b016e98c627a0e5361e6b18ecf3e29cffa8
diff --git a/file.txt b/file.txt
new file mode 100644
index 0000000..34d41e3
--- /dev/null
+++ b/file.txt
@@ -0,0 +1 @@
+Contributing a new file
diff --git a/newfile.txt b/newfile.txt
new file mode 100644
index 0000000..5866898
--- /dev/null
+++ b/newfile.txt
@@ -0,0 +1,2 @@
+New file collaboration
+