Remove placeholder generated lib content

csg/src/lib.rs

@@ -3,18 +3,3 @@ pub mod math;
 pub mod plane;
 
 pub use glam;
-
-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);
-    }
-}