Update credits section with formatting and image

[romeokienzler]

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Developer's Certificate of Origin 1.1

   By making a contribution to this project, I certify that:

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       have the right to submit it under the Apache License 2.0; or

   (b) The contribution is based upon previous work that, to the best
       of my knowledge, is covered under an appropriate open source
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       work with modifications, whether created in whole or in part
       by me, under the same open source license (unless I am
       permitted to submit under a different license), as indicated
       in the file; or

   (c) The contribution was provided directly to me by some other
       person who certified (a), (b) or (c) and I have not modified
       it.

   (d) I understand and agree that this project and the contribution
       are public and that a record of the contribution (including all
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       maintained indefinitely and may be redistributed consistent with
       this project or the open source license(s) involved.