Merge branch 'main' into submission-mpw-two

* main:
  pics: Update the photo of the SHA1 engine
  Add the state engine picture
  README: Update the SHA1.git branch name.
diff --git a/pics/sha1.png b/pics/sha1.png
index 50c7612..f8441f2 100644
--- a/pics/sha1.png
+++ b/pics/sha1.png
Binary files differ