Add script to add new contirbutors

Usage:

truffle exec scripts/add-contributor.js <ethereum address> <ipfs hash>

scripts/add-contributor.js

@@ -0,0 +1,45 @@
+const Registry = artifacts.require('./Registry.sol');
+const Operator = artifacts.require('./Operator.sol');
+const Contributors = artifacts.require('./Contributors.sol');
+
+var bs58 = require('bs58');
+
+function getBytes32FromMultiash(multihash) {
+  const decoded = bs58.decode(multihash);
+
+  return {
+    digest: `0x${decoded.slice(2).toString('hex')}`,
+    hashFunction: decoded[0],
+    size: decoded[1],
+  };
+}
+
+module.exports = function(callback) {
+  Registry.deployed().then(async (registry) => {
+    var operatorAddress = await registry.getProxyFor('Operator');
+    var contributorsAddress = await registry.getProxyFor('Contributors');
+
+    var operator = await Operator.at(operatorAddress);
+    var contributors = await Contributors.at(contributorsAddress);
+
+    let contributorToAddAddress = process.argv[4];
+    if(!contributorToAddAddress) {
+      console.log('please provide an address');
+      proxess.exit();
+    }
+    let ipfsHash = process.argv[5] || 'QmQyZJT9uikzDYTZLhhyVZ5ReZVCoMucYzyvDokDJsijhj';
+    let multihash = getBytes32FromMultiash(ipfsHash);
+    let isCore = true;
+    operator.addContributor(contributorToAddAddress, multihash.digest, multihash.hashFunction, multihash.size, isCore).then((result) => {
+      console.log('Contributor added, tx: ', result.tx);
+    });
+
+    var contributorId = await contributors.getContributorIdByAddress(contributorToAddAddress);
+    operator.addProposal(contributorId, 23, "QmQNA1hhVyL1Vm6HiRxXe9xmc6LUMBDyiNMVgsjThtyevs").then((result) => {
+      console.log('Proposal added, tx: ', result.tx);
+    });
+
+    var proposalId = await operator.proposalsCount();
+    operator.vote(proposalId.toNumber()-1);
+  });
+}