diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..096746c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/node_modules/
\ No newline at end of file
diff --git a/README.md b/README.md
index 8a9ed3c..7e5344d 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
 # github_ws
 
-This repo is a teaching example for the Github Workshop.
+This repo is a teaching example for the Github Workshop.<br>
 The material is created by NTU DAC 5th directors of Acdaemic Affairs
diff --git a/main.py b/main.py
index 4012c7d..bd68f90 100644
--- a/main.py
+++ b/main.py
@@ -1,8 +1,8 @@
 def add(a: int, b: int) -> int:
-    return a - b
+    return a + b
 
 def multiply(a: int, b: int) -> int:
-    pass
+    return a * b
 
 if __name__ == "__main__":
     print("Please input the calculation you want: ")
@@ -14,4 +14,5 @@ def multiply(a: int, b: int) -> int:
     if mode == "add":
         print(f"The sum of {a} and {b} is: {add(a, b)}")
     elif mode == "multiply":
-        print(f"The multiplication of {a} and {b} is: {multiply(a, b)} ")
\ No newline at end of file
+        print(f"The multiplication of {a} and {b} is: {multiply(a, b)} ")
+    print("Hello")
diff --git a/test.py b/test.py
new file mode 100644
index 0000000..e69de29