chore: setup project with cargo, deps, libs, license, and directories

enat-core/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "enat-core"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+
+[dependencies]
+serde = { version = "1.0.228", features = ["derive"] }

enat-core/src/lib.rs

@@ -0,0 +1,14 @@
+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}