Add .gitattributes to ensure correct line endings

It also ensures that make files and shell script are checked out
with lf endings, for compability with the Windows 10 bash

.gitattributes

@@ -0,0 +1,93 @@
+# auto for anything unspecified
+* text=auto
+
+# sources
+*.c text
+*.cc text
+*.cxx text
+*.cpp text
+*.c++ text
+*.hpp text
+*.h text
+*.h++ text
+*.hh text
+*.bat    text
+*.coffee text
+*.css    text
+*.htm    text
+*.html   text
+*.inc    text
+*.ini    text
+*.js     text
+*.jsx    text
+*.json   text
+*.less   text
+*.php    text
+*.pl     text
+*.py     text
+*.rb     text
+*.sass   text
+*.scm    text
+*.scss   text
+*.sh     text
+*.sql    text
+*.styl   text
+*.ts     text
+*.xml    text
+*.xhtml  text
+
+# make files (need to always use lf for compatibility with Windows 10 bash)
+Makefile eol=lf
+*.mk eol=lf
+
+# make files (need to always use lf for compatibility with Windows 10 bash)
+*.sh eol=lf
+
+# documentation
+*.markdown   text
+*.md         text
+*.mdwn       text
+*.mdown      text
+*.mkd        text
+*.mkdn       text
+*.mdtxt      text
+*.mdtext     text
+*.txt        text
+AUTHORS      text
+CHANGELOG    text
+CHANGES      text
+CONTRIBUTING text
+COPYING      text
+INSTALL      text
+license      text
+LICENSE      text
+NEWS         text
+readme       text
+*README*     text
+TODO         text
+
+GRAPHICS
+*.ai   binary
+*.bmp  binary
+*.eps  binary
+*.gif  binary
+*.ico  binary
+*.jng  binary
+*.jp2  binary
+*.jpg  binary
+*.jpeg binary
+*.jpx  binary
+*.jxr  binary
+*.pdf  binary
+*.png  binary
+*.psb  binary
+*.psd  binary
+*.svg  text
+*.svgz binary
+*.tif  binary
+*.tiff binary
+*.wbmp binary
+*.webp binary
+
+# hex files
+*.hex binary