diff --git a/primary/pr/Zhizi20 b/primary/pr/Zhizi20
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/primary/pr/git-basics b/primary/pr/git-basics
new file mode 160000
index 0000000000000000000000000000000000000000..7b2279e6041cc4c028a83d25dc3d7773f85f239c
--- /dev/null
+++ b/primary/pr/git-basics
@@ -0,0 +1 @@
+Subproject commit 7b2279e6041cc4c028a83d25dc3d7773f85f239c