Added missing files

nomos-da/kzgrs-backend/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "kzgrs-backend"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+kzgrs = { path = "../kzgrs" }

nomos-da/kzgrs-backend/src/lib.rs

@@ -0,0 +1,17 @@
+mod common;
+mod encoder;
+
+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);
+    }
+}