Add script/bin for creating an Ethereum wallet

.gitignore

@@ -1 +1,2 @@
 node_modules
+wallet.json

package.json

@@ -6,10 +6,14 @@
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
+  "bin": {
+    "kredits-wallet-create": "scripts/create-wallet.js"
+  },
   "dependencies": {
     "ethereumjs-wallet": "mvayngrib/ethereumjs-wallet",
     "kredits-contracts": "67p/kredits-contracts",
     "node-fetch": "^1.6.3",
+    "prompt": "^1.0.0",
     "web3": "^0.18.4",
     "web3-provider-engine": "^12.0.3"
   },

scripts/create-wallet.js

@@ -0,0 +1,33 @@
+#!/usr/bin/env node
+
+const fs = require('fs');
+const Wallet = require('ethereumjs-wallet');
+const userPrompt = require('prompt');
+
+let schema = {
+  properties: {
+    path: {
+      required: true,
+      default: 'wallet.json'
+    },
+    password: {
+      hidden: true,
+      required: true
+    }
+  }
+};
+
+console.log(`You're about to create an Ethereum wallet. Please provide a path and password for encryption.\n`);
+
+userPrompt.start();
+
+userPrompt.get(schema, (err, result) => {
+  if (err) { throw(err); }
+
+  let wallet = Wallet.generate();
+  let content = JSON.stringify(wallet.toV3(result.password));
+
+  fs.writeFileSync(result.path, content);
+
+  console.log(`\nWrote encrypted wallet config to ${result.path}`);
+});