Added a .gitattributes file to prevent EOL mangling on windows

Hello!

When checking out the repository under Windows, git will modify the EOL of the files in modules/oracle/files. Which is great for editing them. However, when they are used inside the Linux VM there EOL are not compatible with bash or the Oracle installation program. Adding .gitattributes with "* -text" instructs Git to not apply text transformations to the files in that directory. It then works under Windows.