[IMG123] Add developer documentations (!136) · Merge requests · Zhang, Chen / iMars3D · GitLab

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Zhang, Chen requested to merge IMG123_init_devdocs into next Mar 21, 2022

Original Gitlab Task: IMG123

This PR introduces the following changes:

update git ignore list for repo management
add new folder dev-docs to store developer documentation
add overview page for developer documentation.

The developer documentation is build with sphinx, and the html version can be built by running make html inside dev_docs.