DOC: Added README file.
Merge pull request #1 from arokem/readme

DOC: Added README file.
Fix the link to the wiki.
Merge pull request #2 from arokem/readme_fixes

Fix the link to the wiki.
Added a .gitignore file.
Merge pull request #3 from arokem/gitignore

Added a .gitignore file.
Merge branch 'master' of github.com:vistalab/vistasoft into new-mrVista

* 'master' of github.com:vistalab/vistasoft:
  Added a .gitignore file.
  Fix the link to the wiki.
  DOC: Added README file.