Add the dotenv for env variables and small improvements

.gitignore

@@ -4,3 +4,6 @@ node_modules
 #Buidler files
 cache
 artifacts
+
+# env variables
+.env

README.md

@@ -1,14 +1,46 @@
-# Example of onchain smart contract wallet generation that is not deployed until needed.
+# zkSync Create2 example
+
+Example of onchain smart contract wallet generation that is not deployed until needed.
+
+
+## Demo steps
+
+1. Create a `.env` file and set 2 environment variables:
+
+```
+ETH_PRIVATE_KEY=0x020......... (Make sure it's prefixed with 0x)
+
+INFURA_ID=25...........
+```
+
+* `ETH_PRIVATE_KEY` env variable to private key of the account with ropsten ethereum.
+* `INFURA_ID` the Project ID of an eth project: from [Infura](https://infura.io/dashboard/ethereum)
+
+2. Run:
+
+```sh
+$ yarn install
+$ yarn run-example
+```
+
+Which runs `index.js` that:
+
+* Generates wallet for `contract/Counter.sol` contract with custom salt arguments and deployer deployed at address stored in `factoryAddress.json`
+* Deposits ETH to this account
+* Sets signing key for this account
+* Makes transfer to check if account is unlocked
+
+3. To deploy contract using CREATE2 run:
+
+```sh
+$ yarn deploy-with-create2 $SALT
+```
+
+where `$SALT` is salt that was printed on step 2
+
+
+## Built with
 
 * zkSync branch: https://github.com/matter-labs/zksync/tree/create2-deployment
 * deployed to: https://ropsten-beta.zkscan.io/
 * zksync.js: 0.8.2-beta
-
-
-1. Set `ETH_PRIVATE_KEY` env variable to private key of the account with ropsten ethereum.
-2. Run `yarn run-example` to run `index.js` script that.
-    * Generates wallet for `contract/Counter.sol` contract with custom salt arguments and deployer deployed at address stored in `factoryAddress.json`
-    * Deposits ETH to this account 
-    * Sets signing key for this account
-    * Makes transfer to check if account is unlocked
-3. To deploy contract using CREATE2 run `yarn deploy-with-create2 $SALT` where `$SALT` is salt that was printed on step 2

buidler.config.js

@@ -1,5 +1,7 @@
 const fs = require("fs");
 
+require('dotenv').config();
+
 usePlugin("@nomiclabs/buidler-waffle");
 
 task("deploy-create2", "Deploys contract with the given salt")
@@ -25,7 +27,7 @@ module.exports = {
   defaultNetwork: "ropsten",
   networks: {
     ropsten: {
-        url: "https://ropsten.infura.io/v3/84842078b09946638c03157f83405213",
+        url: `https://ropsten.infura.io/v3/${process.env.INFURA_ID}`,
         accounts: [process.env.ETH_PRIVATE_KEY],
     }
   },

index.js

@@ -1,12 +1,13 @@
 const ethers = require("ethers");
 const zksync = require("zksync");
-
 const crypto = require("crypto");
 
+require('dotenv').config();
+
 async function createDepositWallet() {
     const ethProvider = new ethers.providers.getDefaultProvider("ropsten");
     const ethSigner = new ethers.Wallet(process.env.ETH_PRIVATE_KEY).connect(ethProvider);
-    const zksyncProvider = await zksync.getDefaultProvider("ropsten-beta")
+    const zksyncProvider = await zksync.getDefaultProvider("ropsten-beta");
     return zksync.wallet.Wallet.fromEthSigner(ethSigner, zksyncProvider);
 }
 
@@ -30,15 +31,15 @@ async function main() {
         saltArg,
     };
 
-    const zksyncProvider = await zksync.getDefaultProvider("ropsten-beta")
+    const zksyncProvider = await zksync.getDefaultProvider("ropsten-beta");
     const ethSigner = new zksync.create2wallet.Create2WalletSigner(signer.pubKeyHash(), create2Auth);
-    console.log("Generated new account");
-    console.log("address:",ethSigner.address);
-    console.log("salt:",ethSigner.salt);
+    console.log("============ Generated new account ============");
+    console.log("address: ", ethSigner.address);
+    console.log("salt: ", ethSigner.salt);
 
     const zksWallet = await zksync.wallet.Wallet.fromEthSigner(ethSigner, zksyncProvider, signer, null, { verificationMethod: "ERC-1271", isSignedMsgPrefixed: true});
 
-    console.log("Depositing to new account");
+    console.log("============ Depositing to new account ============");
     const depositWallet = await createDepositWallet();
     const depositHandle = await depositWallet.depositToSyncFromEthereum({
         depositTo: zksWallet.address(),
@@ -48,14 +49,14 @@ async function main() {
     });
     await depositHandle.awaitReceipt();
 
-    console.log("Setting ChangePubkey for Create2Walelt");
+    console.log("============ Setting ChangePubkey for Create2Wallet ============");
     const chpk = await zksWallet.setSigningKey({
         feeToken: "ETH",
         changePubkeyType: "Create2Contract"
     });
     await chpk.awaitReceipt();
 
-    console.log("Making transfer");
+    console.log("============ Making transfer ============");
     const transfer = await zksWallet.syncTransfer({
         to: zksWallet.address(),
         token: "ETH",
@@ -69,6 +70,6 @@ async function main() {
 main()
     .then(() => process.exit(0))
     .catch((e) => {
-        console.error("Error: ",e);
+        console.error("Error: ", e);
         process.exit(1)
     })