Update the README.md to include some basic build instructions.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
README: use 4 space indents (markdown) rather than 2 (mediawiki)

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #1 from djs55/update-readme

Update the README.md to include some basic build instructions.
Merge pull request #2 from djs55/update-readme

README: use 4 space indents (markdown) rather than 2 (mediawiki)