Validate sha1 of downloaded jar
diff --git a/sha1sum.txt b/sha1sum.txt
new file mode 100644
index 0000000..2c32d96
--- /dev/null
+++ b/sha1sum.txt
@@ -0,0 +1 @@
+1940326db9874336a34d52e423a86ee5de5ca824  /opt/sling/org.apache.sling.starter.jar