Add an example IMG.CFG for the ZX Spectrum FDC-1 / Sandy FDD2 interfaces

examples/Host/Sinclair_ZX_Spectrum/Sandy_FDD2/IMG.CFG

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+## IMG.CFG for the Sandy FDD2 interface.
+
+# Sandy FDD2 is a clone of the FDC-1 by Technology Research Ltd.
+# Using a 1771 controller chip, it supports single-density (FM) recording
+# only, unlike the later Beta Disk interfaces.
+
+# *.ss40.img: Single-sided 40 cylinders.
+[ss40::102400]
+cyls = 40
+heads = 1
+secs = 10
+bps = 256
+mode = fm
+interleave = 2
+
+# *.ss80.img: Single-sided 80 cylinders.
+[ss80::204800]
+cyls = 80
+heads = 1
+secs = 10
+bps = 256
+mode = fm
+interleave = 2
+
+# *.ds40.img: Double-sided 40 cylinders.
+[ds40::204800]
+cyls = 40
+heads = 2
+secs = 10
+bps = 256
+mode = fm
+interleave = 2
+tracks = 0-39.1
+  h = 0
+
+# *.ds80.img: Double-sided 80 cylinders.
+[ds80::409600]
+cyls = 80
+heads = 2
+secs = 10
+bps = 256
+mode = fm
+interleave = 2
+tracks = 0-79.1
+  h = 0