Add topics for IoTSharp

[maikebing]

Please confirm this pull request meets the following requirements:

• I followed the contributing guidelines: https://github.com/github/explore/blob/main/CONTRIBUTING.md.
• I have no affiliation with the project I am suggesting (as a maintainer, creator, contractor, or employee).

Which change are you proposing?

• Suggesting edits to an existing topic or collection
• Curating a new topic or collection
• Something that does not neatly fit into the binary options above

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Curating a new topic or collection

• I've formatted my changes as a new folder directory, named for the topic or collection as it appears in the URL on GitHub (e.g. https://github.com/topics/[NAME] or https://github.com/collections/[NAME])
• My folder contains a *.png image (if applicable) and index.md
• All required fields in my index.md conform to the Style Guide and API docs: https://github.com/github/explore/tree/main/docs

Please replace this line with an explanation of why you think this topic or collection should be curated.

Something that does not neatly fit into the binary options above

• My suggested edits are not about an existing topic or collection, or at least not a single one
• My suggested edits are not about curating a new topic or collection, or at least not a single one
• My suggested edits conform to the Style Guide and API docs: https://github.com/github/explore/tree/main/docs

Please replace this line with an explanation of your proposed changes.

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Please note: we will close your PR without comment if you do not check the boxes above and provide ALL requested information.

[ipc103]

I have no affiliation with the project I am suggesting (as a maintainer, creator, contractor, or employee).

This box was checked, but @maikebing you're listed as the creator of the project. We've recently updated our guidelines to state:

I am not the sole author or employee of a company who created the topic or collection I'm changing.

Can you update the checkboxes in the PR template to reflect if this is true?

[ipc103]

Actually, looking at this again, I am going to close this one. Unfortunately, as per our contribution guidelines, we don't allow self promotion if you are a maintainer of the project:

Maintainers of a project cannot add a topic or collection for their own project. If a topic is popular enough to warrant inclusion, someone else will add or improve it.

We do this so that project get curated if there is enough support/activity in the community. Thanks anyway for the contribution ❤️.