Simplest form file uploader.
It just saves uploaded file from HTML form to the new file on the disk.
-Also it calculates BLAKE2s checksum, replying with it in the answer.
+Also it calculates BLAKE2b checksum, replying with it in the answer.
+
+You can upload files with curl:
+
+ curl -F fileupload=@somedata.tar.gpg http://localhost:8086/upload/
+
+You can verify integrity locally:
+
+ b2sum -a blake2b somedata.tar.gpg