docs: Add a diagram for the internals of sysupdate

I had to sketch this out before I could get the internals of
systemd-sysupdate straight in my head, particularly around how an
`UpdateSet` points to one `Instance` from each of a set of `Resource`s,
and those `Instance`s are either all sources or all targets.

Hopefully this is useful to the next person to look at the code.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

diff --git a/docs/sysupdate-objects.svg b/docs/sysupdate-objects.svg
new file mode 100644 (file)
index 0000000..884cb65
--- /dev/null
+++ b/docs/sysupdate-objects.svg
@@ -0,0 +1,851 @@
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