Added new How-To page to fix Issue #13

The following steps were completed in order to try to close out Issue #13
- Moved existing How-To Article into new How-To folder
- Added all necessary images to new local Images folder
- Added steps explaining how to use HTTP POST Hook URL, including images
- Moved existing How-To Article image into the new Images folder
Merge pull request #17 from gep13/Issue-13

Added new How-To page to fix Issue #13