add license information for DIOPRA-L image

backend/corpora/goodreads/description/goodreads.md

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-DIOPTRA-L contains Goodreads reviews of contemporary literary texts that have been translated from and into the following languages: Afrikaans, Dutch, English, French, German, Italian, Portuguese and Spanish. A variety of genres are represented, and the corpus is searchable by, for example, language pair, author, title and genre. For more information, or suggestions, please contact Haidee Kotze ([email protected]) and Gys-Walt van Egdom ([email protected])
+DIOPTRA-L contains Goodreads reviews of contemporary literary texts that have been translated from and into the following languages: Afrikaans, Dutch, English, French, German, Italian, Portuguese and Spanish. A variety of genres are represented, and the corpus is searchable by, for example, language pair, author, title and genre. For more information, or suggestions, please contact Haidee Kotze ([email protected]) and Gys-Walt van Egdom ([email protected])
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+### Image attribution
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+The DIOPTRA-L logo used as an image for this corpus was created by Gys-Walt van Egdom and Haidee Kotze and is licensed under a [Creative Commons Attribution-Share Alike 4.0 licence](https://creativecommons.org/licenses/by-sa/4.0/deed.en).

backend/corpora/goodreads/images/DioptraL.png.license

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+(c) Gys-Walt van Egdom (https://www.uu.nl/staff/GMWvanEgdom) and Haidee Kotze (https://www.uu.nl/staff/HKotze)
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+Licensed under a Creative Commons Attribution-Share Alike 4.0 International licence (https://creativecommons.org/licenses/by-sa/4.0/deed.en).