Add SurfaceModelNodesSelector extension

[saimasafdar2021]

New extension

• Extension has a reasonable name (not too general, not too narrow, suggests what the extension is for)
• Repository name is Slicer+ExtensionName
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• Any known related patents must be mentioned in the extension description.
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• Screenshot URLs (screenshoturls) are correct, contains at least one
• Homepage URL points to valid webpage containing the following:
  • Extension name
  • Short description: 1-2 sentences, which summarizes what the extension is usable for
  • At least one nice, informative image, that illustrates what the extension can do. It may be a screenshot.
  • Description of contained modules: at one sentence for each module
  • Tutorial: step-by-step description of at least the most typical use case, include a few screenshots, provide download links to sample input data set
  • Publication: link to publication and/or to PubMed reference (if available)
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  • Content of submitted s4ext file is consistent with the top-level CMakeLists.txt file in the repository (description, URLs, dependencies, etc. are the same)
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[saimasafdar2021]

Hi,
I have added the missing fields in the s4ext file, which is the contributors and description field. Also updated the cmakelist.ext file.

Please let me know of any updates and when it will get published.

thankyou

regards,
Saima