feat: add codegen lib

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/crunch-codegen/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "crunch-codegen"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+crunch-traits.workspace = true
+
+anyhow.workspace = true
+tracing.workspace = true
+tokio.workspace = true
+async-trait.workspace = true

crates/crunch-codegen/src/lib.rs

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