docs: Add GUI.md

Change-Id: Ic7ffb8dea4521af95cb87e578be3eb46af6e8f6e
diff --git a/docs/img/gui/host-tool.png b/docs/img/gui/host-tool.png
new file mode 100644
index 0000000..4f54d53
--- /dev/null
+++ b/docs/img/gui/host-tool.png
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