add detailed erc20

contracts/ERC20Custom.sol

@@ -0,0 +1,14 @@
+pragma solidity 0.6.12;
+
+import "@openzeppelin/contracts/presets/ERC20PresetMinterPauser.sol";
+
+
+contract ERC20Custom is ERC20PresetMinterPauser {
+
+    /**
+     * @dev Allows overriding the name, symbol & decimal of the base ERC20 contract
+     */
+    constructor(string memory name, string memory symbol, uint8 decimals) public ERC20PresetMinterPauser(name, symbol) {
+        _setupDecimals(decimals);
+    }
+}

test/tokens/erc20/erc20Custom.js

@@ -0,0 +1,23 @@
+/**
+ * Copyright 2020 ChainSafe Systems
+ * SPDX-License-Identifier: LGPL-3.0-only
+ */
+
+const TruffleAssert = require('truffle-assertions');
+const Ethers = require('ethers');
+const { it } = require('ethers/wordlists');
+
+const ERC20CustomContract = artifacts.require("ERC20Custom");
+
+contract('ERC20Custom - [ERC20]', async () => {
+
+    it('[sanity] contract should be deployed successfully', async () => {
+        TruffleAssert.passes(await ERC20CustomContract.new("token", "TOK", 18));
+    });
+
+    it('Decimals can be modified', async () => {
+        const ERC20Instance = await ERC20CustomContract.new("token", "TOK", 10);
+        const decimals = await ERC20Instance.decimals.call();
+        assert.isTrue(decimals == 10, "Contract wasn't successfully marked burnable");
+    });
+});