Add constraints for relevant curves (#3)

bls12_377/src/constraints/pairing.rs

@@ -0,0 +1,10 @@
+use crate::Parameters;
+
+/// Specifies the constraints for computing a pairing in the BLS12-377 bilinear group.
+pub type PairingVar = ark_r1cs_std::pairing::bls12::PairingVar<Parameters>;
+
+#[test]
+fn test() {
+    use crate::Bls12_377;
+    ark_curve_constraint_tests::pairing::bilinearity_test::<Bls12_377, PairingVar>().unwrap()
+}