diff --git a/docs/protocol entities.odg b/docs/protocol entities.odg new file mode 100644 index 0000000..9df2712 Binary files /dev/null and b/docs/protocol entities.odg differ diff --git a/docs/protocol entities.pdf b/docs/protocol entities.pdf new file mode 100644 index 0000000..efda374 Binary files /dev/null and b/docs/protocol entities.pdf differ