Update and rename readme.md to README.md

Added some information about what you get out of this demo in terms of UDO's
HMAC sample program

RFC-2104 compliant HMAC program in BASIC
Merge pull request #3 from jcui-rs/master

Merged HMAC sample code (using U2 Basic DIGEST functions).
Updated readme to use Markdown syntax

Updated readme to use Markdown syntax and also clarified requirements around UniData/UniVerse versions
Merged Jing's updated comments
Corrected license information

Also removed authorship and date information as this can be tracked via commit details.
Added UDO Demos directory README file
Merge pull request #5 from dmcgrath/master

Updated readme's and structure changes (HMAC - Security)
Starting some Java examples
Add FileDemo as a UOJ sample

Minor fixes from the U2 Clients samples directory version
Merge pull request #1 from RocketSoftware/master

Testing