add ultradata code tech report

.gitattributes

@@ -58,3 +58,6 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 # Video files - compressed
 *.mp4 filter=lfs diff=lfs merge=lfs -text
 *.webm filter=lfs diff=lfs merge=lfs -text
+# PDF
+*.pdf filter=lfs diff=lfs merge=lfs -text
+

tech_report/UltraData_Code_Tech_Report.pdf

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9dcac9c75fd901ead2776e052fb2f9afb195da4ba99e8090276ea0e7014a499b
+size 8047019