Add AtomicSwap circuit

Author: OmegaTymbJIep

circuits/atomic_swap.circom

@@ -0,0 +1,16 @@
+pragma circom 2.1.1;
+
+include "./ecdsa/ecdsa.circom";
+include "../node_modules/circomlib/circuits/poseidon.circom";
+
+template AtomicSwap() {
+    signal input secret[4];
+
+    signal output pubkey[2][4];
+    signal output secretHash;
+
+    pubkey <== ECDSAPrivToPub(64, 4)(secret);
+    secretHash <== Poseidon(4)(secret);
+}
+
+component main = AtomicSwap();