Update readme.md

keyboards/DeltaSplit75/case files/readme.md

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 case files!
 Tested Configuration:
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 Top Bezel -> 2x 3mm Acrylic
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 Plates -> 1.5mm Aluminium
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 Middle layers -> 3mm Acrylic
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 Bottom Layer -> 3mm Acrylic
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 Files available in DXF format in DXF Files folder