Documentation: Adding programming guide for new users

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Help us complete, proofread, or verify the information in the documentation guide for PDMSDK.

Compiled version: https://bluebytesystemsinc.github.io/SOLIDWORKS-PDM-API-SDK/docs/getting-started.html

Working directory: https://github.com/BlueByteSystemsInc/SOLIDWORKS-PDM-API-SDK/tree/master/docfx/docs

To contribute, please make a pull request by:

• Editing the content of the markdown files.
• Adding your own or starting a new one that does not exist.

Request PR to be merged and HTML to be compiled by @AmenJlili