Add repl.js helper script

This is similar to the cli.js helper but only provides an initialized
`kredits` instance.
The cli.js is for executing contract functions

README.mdown

@@ -81,11 +81,15 @@ At some point these should be moved into a real nice CLI.
 To run these scripts use `truffle exec`. For example: `truffle exec scripts/add-proposal.js` 
 
 ### cli.js
-
 Call any function on any contract:
 
     $ truffle exec scripts/cli.js
 
+### repl.js
+Similar to cli.js but only provides a REPL with an initialized `kredits` instance.
+
+    $ truffle exec scripts/repl.js
+
 ### add-contributor.js
 Adds a new core contributor, creates a proposal for the new contributor and votes for that one. 
 

scripts/repl.js

@@ -0,0 +1,25 @@
+const REPL = require('repl');
+const promptly = require('promptly');
+
+const ethers = require('ethers');
+const Kredits = require('../lib/kredits');
+
+module.exports = function(callback) {
+  const Registry = artifacts.require('./Registry.sol');
+  Registry.deployed().then(async (registry) => {
+    const networkId = parseInt(web3.version.network);
+    const provider = new ethers.providers.Web3Provider(
+      web3.currentProvider, { chainId: networkId }
+    );
+    const kredits = await Kredits.setup(provider, provider.getSigner());
+    console.log(`defined variables: kredits, web3`);
+    let r = REPL.start();
+    r.context.kredits = kredits;
+    r.context.web3 = web3;
+
+    r.on('exit', () => {
+      console.log('Bye');
+      callback();
+    });
+  });
+}