Update .gitattributes - support for shell scripts

Added support for Windows shell scripts (`.bat` and `.cmd`) 
Added support for Linux/MacOS shell scripts (`.sh`)

.gitattributes

@@ -7,10 +7,12 @@
 # Define some file types explicitly as being text.
 # This makes sure that we can never inadvertently get
 # a file of this type into the repo with a line ending
-# other than the Unix-style line ending. 
+# other than the one designated below.
 # This will also override the user's own global git settings
 # for these file types.
 
+*.bat             text eol=crlf
+*.cmd             text eol=crlf
 *.css             text eol=lf
 *.dtd             text eol=lf
 *.form            text eol=lf
@@ -21,6 +23,7 @@
 *.md              text eol=lf
 *.properties      text eol=lf
 *.scss            text eol=lf
+*.sh              text eol=lf
 *.svg             text eol=lf
 *.txt             text eol=lf
 *.xml             text eol=lf