Added a class for custom exceptions

Author: jongpie

src/classes/Exceptions.cls

@@ -0,0 +1,6 @@
+public without sharing class Exceptions {
+    /* Contains any custom exceptions classes */
+
+    public class TriggerHandlerException extends Exception {}
+
+}

src/classes/Exceptions.cls-meta.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>37.0</apiVersion>
+    <status>Active</status>
+</ApexClass>