Configure .gitattributes to manage line endings

Mark test resources as binary to prevent line ending normalization
Some of the test resources are used to test handling of line endings
in JGit.

Change-Id: Idd9ba604945797d1cd1f3af1a1987aee3188e1d6

.gitattributes

diff --git a/.gitattributes b/.gitattributes
index 7543492..70de594 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,2 +1,14 @@
-*      text=auto
+* text=auto
+
+*.asc binary
+*.gif binary
+*.gitindex.dat binary
+*.key binary
+*.patch binary
+*.pdf binary
+*.png binary
+org.eclipse.jgit.test/tst-rsrc/org/eclipse/jgit/diff/** binary
+org.eclipse.jgit.test/tst-rsrc/org/eclipse/jgit/test/resources/** binary
+org.eclipse.jgit.test/tst-rsrc/org/eclipse/jgit/util/io/** binary
+
 *.java diff=java