Create CONTRIBUTING

CONTRIBUTING

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+# Contributing
+
+## How this branch of the repo is organized
+* **crosswalk/** - contains spreadsheet crosswalking CF/ACDD to DarwinCore.
+* **data/** - contains example data files.
+* **notebooks/** - contains example Python notebooks for reading data files.
+* **templates/** - contains [common data language (cdl)](https://www.unidata.ucar.edu/software/netcdf/workshops/most-recent/nc3model/Cdl.html#:~:text=CDL%20(Common%20Data%20Language)%20is,for%20netCDF%20objects%20and%20data.&text=This%20example%20specifies%20a%20netCDF,data%20values%20for%20the%20variable.) netCDF templates.
+* README-ArchiveSOP.md - Documentation about the procedure for archiving at NCEI.
+* README-ATN2DWC.md - Documentation about the mapping from ATN netCDF to DwC.
+
+## How to Contribute
+The easiest way to get started is to file an issue to tell us about a spelling mistake, some awkward wording,
+or a factual error. This is a good way to introduce yourself and to meet some of our community members.
+
+1. If you have a [GitHub][github] account, or are willing to [create one][github-join], but do not know how to use Git,
+you can report problems or suggest improvements by [creating an issue][issues]. This allows us to assign the item 
+to someone and to respond to it in a threaded discussion.
+
+2. If you are comfortable with Git, and would like to add or change material, you can submit a pull request (PR).
+Instructions for doing this are [included below](#using-github).
+
+## Where to Contribute
+Contribute your updates to the appropriate files using [markdown syntax](https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax). You can:
+
+1. Update an existing page.
+2. Create a new page.
+
+## Using GitHub
+
+If you choose to contribute via GitHub, you may want to look at [How to Contribute to an Open Source Project on 
+GitHub][how-contribute]. To manage changes, we follow [GitHub flow][github-flow]. To use the web interface for 
+contributing to a file:
+
+1. Fork the originating repository to your GitHub profile.
+2. Within your version of the forked repository, move to the `gh-pages` branch.
+3. Navigate to the file(s) you wish to change within the branch and make revisions as required.
+4. Commit all changed files within the appropriate branch.
+5. Create pull requests from your changed branch to the `gh-pages` branch within the originating 
+repository.
+6. If you receive feedback, make changes using your issue-specific branches of the forked repository and the pull 
+requests will update automatically.
+7. Repeat as needed until all feedback has been addressed.
+
+When starting work, please make sure your clone of the originating `gh-pages` branch is up-to-date before creating your own 
+revision-specific branch(es) from there.
+
+[github]: https://github.com
+[github-flow]: https://guides.github.com/introduction/flow/
+[github-join]: https://github.com/join
+[how-contribute]: https://app.egghead.io/playlists/how-to-contribute-to-an-open-source-project-on-github
+[issues]: https://guides.github.com/features/issues/