Adding the Voltha missing manual

Change-Id: Ic6cc2e5ed80e04fb009809c9a2fca393e5dcabfd
diff --git a/docs/manuals/user/old/architecture.svg b/docs/manuals/user/old/architecture.svg
new file mode 100644
index 0000000..a02ce2f
--- /dev/null
+++ b/docs/manuals/user/old/architecture.svg
@@ -0,0 +1,1940 @@
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