Start working on ERC20 specs

certora/scripts/verifyERC20.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -euxo pipefail
+
+certoraRun \
+    certora/harnesses/ERC20Harness.sol \
+    --verify ERC20Harness:certora/specs/ERC20.spec \
+    --solc solc \
+    --optimistic_loop \
+    $@