Add explainer video

.gitattributes

@@ -42,3 +42,4 @@ figures/cover.png filter=lfs diff=lfs merge=lfs -text
 figures/dashboard.png filter=lfs diff=lfs merge=lfs -text
 figures/harness-output.png filter=lfs diff=lfs merge=lfs -text
 figures/report-review.png filter=lfs diff=lfs merge=lfs -text
+phantom-dfir-how-it-works.mp4 filter=lfs diff=lfs merge=lfs -text

phantom-dfir-how-it-works.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b29cc97ce6f649fbcfdfb494d312d001a8a57dd445a9e767f972346ccc370894
+size 13522071