updated for .env file

.env

@@ -0,0 +1,3 @@
+# This is where you add your environment variables
+MNEMONIC='cat dog frog....'
+RINKEBY_RPC_URL='www.infura.io/asdfadsfafdadf'

.env.example

@@ -0,0 +1,2 @@
+MNEMONIC='cat dog frog....'
+RINKEBY_RPC_URL='www.infura.io/asdfadsfafdadf'

README.md

@@ -28,8 +28,16 @@ Right now this repo only works with rinkeby. Run the following.
 ### Setup Environment Variables
 You'll need a `MNEMONIC` and a rinkeby `RINKEBY_RPC_URL` environment variable. Your `MNEMONIC` is your seed phrase of your wallet. You can find an `RINKEBY_RPC_URL` from node provider services like [Infura](https://infura.io/)
 
-Then, either set them in a `bash_profile` file or export them into your terminal like:
+Then, you can create a `.env` file with the following.
 
+```bash
+MNEMONIC='cat dog frog....'
+RINKEBY_RPC_URL='www.infura.io/asdfadsfafdadf'
+```
+
+Or, set them in a `bash_profile` file or export them directly into your terminal. You can learn more about [environment variables here](https://www.twilio.com/blog/2017/01/how-to-set-environment-variables.html). 
+
+To run them directly in your terminal, run: 
 ```bash
 export MNEMONIC='cat dog frog....'
 export RINKEBY_RPC_URL='www.infura.io/asdfadsfafdadf'

package.json

@@ -17,7 +17,8 @@
   "dependencies": {
     "@chainlink/contracts": "0.0.8",
     "@openzeppelin/contracts": "^3.1.0",
-    "@truffle/hdwallet-provider": "^1.0.40"
+    "@truffle/hdwallet-provider": "^1.0.40",
+    "dotenv": "^8.2.0"
   },
   "devDependencies": {
     "@chainlink/belt": "^0.0.1",

truffle-config.js

@@ -1,4 +1,5 @@
 const HDWalletProvider = require('@truffle/hdwallet-provider')
+require('dotenv').config()
 // 0x5F3313814F7FB3E11C4a240141689BA9933c5607
 module.exports = {
   networks: {