tree: add hash file

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/tree/tree.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256	4dc470a74880338b01da41701d8db90d0fb178877e526d385931a007d68d7591	tree-1.6.0.tgz