Update README.md

README.md

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 <div>
    <h1 id="title">gt_structure_4_2</h1>
-   <p id="paragraph">OCR-D structure Ground Truth</p>
+    <p id="paragraph">The repo <b>gt_structure_4_2</b> is part of the OCR-D Ground Truth Structure corpus. Only the structure of the printed page is annotated. The corpus was created as a result of the DFG project OCR-D. Corrections and extensions can be reported, please use the Issues.</p>
    <h2>Metadata</h2>
    <dl class="grid">
       <dt id="Language">Language:</dt>