Non-code change: Initial set up of files
for hg-git interopation. .gitignore created to ignore
Mercurial subrepository ReferencedAssemblies, and
.gitattributes created to suppress any newline
normalization as I suspect that this would break
interoperation. README.md also updated with the most
basic build instructions.
Merge pull request #1 from tcchau/master

Initial set up of files for interoperability