diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 00000000..ef02dbd6
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diff --git a/P5_merge.png b/P5_merge.png
new file mode 100644
index 00000000..2e2d174a
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diff --git a/P5_remote.png b/P5_remote.png
new file mode 100644
index 00000000..29c43963
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diff --git a/README.md b/README.md
index 440d1f7d..5f93392b 100755
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
 # Playground
 
+
+taking cs107 is hard
+Shijia_Zhang
+
+
 A place to play with `git`.
 
 ### Fall 2021
diff --git a/add_line.txt b/add_line.txt
new file mode 100644
index 00000000..29b40538
--- /dev/null
+++ b/add_line.txt
@@ -0,0 +1 @@
+add_line_p5