diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0daf272
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
+/target
+**/*.rs.bk
+
+
+#Added by cargo
+#
+#already existing elements are commented out
+
+#/target
+#**/*.rs.bk
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..c20a2e9
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "add"
+version = "0.1.0"
+authors = ["llgoer <llgoer@github.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..5c83c9b
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,22 @@
+// Copyright 2019 GoKeep Author. All rights reserved.
+// license that can be found in the LICENSE file.
+
+pub fn add(a: i32, b: i32) -> i32 {
+    a + b
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    
+    #[test]
+    fn test_add() {
+        assert_eq!(add(1, 2), 3);
+    }
+
+
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}