init new cargo project

.gitignore

@@ -1,2 +1,6 @@
 *.swp
 target/
+
+/target/
+**/*.rs.bk
+Cargo.lock

Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "rustlings"
+version = "0.1.0"
+authors = ["olivia <olivia@fastmail.com>"]
+
+[dependencies]

src/lib.rs

@@ -0,0 +1,7 @@
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}