docs: Add GUI.md

Change-Id: Ic7ffb8dea4521af95cb87e578be3eb46af6e8f6e
diff --git a/docs/img/gui/host-config.png b/docs/img/gui/host-config.png
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index 0000000..5cd79a8
--- /dev/null
+++ b/docs/img/gui/host-config.png
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