Added tutorial 29

Author: James Lockhart

README.md

@@ -31,6 +31,7 @@ The companion to the Youtube tutorials
 - [Learning Solidity : Tutorial 26 Auditing, Security and Testing (Long, but important)](https://www.youtube.com/watch?v=LGCMZ7S_ITE)
 - [Learning Solidity : Tutorial 27 Getting started with browser development using Metamask](https://www.youtube.com/watch?v=eog2eYrPEu0)
 - [Learning Solidity : Tutorial 28 Address book on the blockchain powered by Angular](https://www.youtube.com/watch?v=bvxKICus3bw)
+- [Learning Solidity : Tutorial 29 What is WEI and how is Ether defined?](https://www.youtube.com/watch?v=yOfYNUQVjxk)
 ### Support
 
 - [Invalid implicit conversion of arrays from storage to memory and vice-versa](https://github.com/willitscale/learning-solidity/blob/master/support/INVALID_IMPLICIT_CONVERSION_OF_ARRAYS.MD)

tutorial-28/public/truffle.js

@@ -0,0 +1,18 @@
+pragma solidity ^0.4.0;
+
+contract Denominations {
+    // WEI Denominations
+    uint constant WEI = 1 wei;
+    uint constant KWEI = 1000 wei;
+    uint constant MWEI = 1000000 wei;
+    uint constant GWEI = 1000000000 wei;
+
+    // Ether Denominations
+    uint constant MICROETHER = 1 szabo;
+    uint constant MILLIETHER = 1 finney;
+    uint constant ETHER = 1 ether;
+    uint constant KETHER = 1000 ether;
+    uint constant METHER = 1000000 ether;
+    uint constant GETHER = 1000000000 ether;
+    uint constant TETHER = 1000000000000 ether;
+}