Add first architecture draft

.gitignore

+illustrations/.$VIPS-grid-architecture.drawio.bkp

illustrations/VIPS-grid-architecture.drawio

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+  <diagram name="Page-1" id="dvs87JXsa19xrcxPMqOR">
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+      <root>
+        <mxCell id="0" />
+        <mxCell id="1" parent="0" />
+        <mxCell id="UnkDXDVX_iZ1AtATogyI-1" value="" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
+          <mxGeometry x="350" y="390" width="120" height="60" as="geometry" />
+        </mxCell>
+      </root>
+    </mxGraphModel>
+  </diagram>
+</mxfile>