Try to fix the line ending problem

... at github when using the browser for a PR.

It seems that the web interface inserts an additional CR
and doesn't stick to the LF line endings.

Not sure it helps though. It can't hurt though.

.gitattributes

@@ -0,0 +1,9 @@
+.*sh    eol=lf
+.*md    eol=lf
+*.html  eol=lf
+*.txt   eol=lf
+*.txt   eol=lf
+*.1     eol=lf
+*.t     eol=lf
+Dockerfile*  eol=lf
+*.csvfile    eol=lf