Add contributing guidelines

Signed-off-by: Thomas A. Christensen II <25492070+MillironX@users.noreply.github.com>

CONTRIBUTING.md

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+# Contributing to Kelpie.jl
+
+Thanks for pitching in to Kelpie. Here's a basic outline of how we muster the
+mob of ideas and code from everyone into a single package.
+
+## Step 1. Check for a reported issue
+
+If you have a problem with or suggestion for Kelpie, check to see if someone
+else has the same or a similar idea on our [Issues page]. If that issue exists,
+use a [GitHub reaction] to support it. If you can't find anything similar,
+
+## Step 2. Open a new issue
+
+Open a [new issue], and follow the template for your type of issue (there are
+separate templates for suggestions and bugs).
+
+## Step 3. Fork the repo
+
+If you think you can solve an issue, then [fork] the MillironX/Kelpie.jl repo to
+your own GitHub account. To keep things, clean, please [create a new branch] for
+your work.
+
+## Step 4. Code
+
+There are many ways to code on a Julia package. This is my favorite, and there
+are dot files in the repo to support it.
+
+1. Install [Visual Studio Code]
+2. Clone your fork of the repo
+3. Open the package folder in VSCode
+4. [Install the recommended extensions]
+5. Checkout your branch
+6. Press <kbd>Alt</kbd>+<kbd>J</kbd>, <kbd>Alt</kbd>+<kbd>O</kbd> to launch an
+   integrated Julia REPL
+7. Press <kbd>]</kbd>, and then type `activate .` <kbd>ENTER</kbd> `instantiate`
+   <kbd>ENTER</kbd> <kbd>BACKSPACE</kbd>
+
+Of note while you code:
+
+- We use the [Blue style] for Julia files
+
+## Step 5. Add or update tests
+
+Make sure that your code passes all the current tests by using the REPL `] test`
+command. If you change functionality, please add tests for that functionality to
+the `test/runtests.jl` file.
+
+## Step 6. Update the Changelog
+
+Add a note to the `CHANGELOG.md` file under the "Unreleased" header indicating
+what kind of change you made. See <https://keepachangelog.com> for the required
+format.
+
+## Step 7. Pull request
+
+Submit a pull request against the `master` branch and wait for it to be merged.
+
+[blue style]: https://github.com/invenia/BlueStyle
+[create a new branch]: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-and-deleting-branches-within-your-repository#creating-a-branch
+[fork]: https://github.com/MillironX/Kelpie.jl/fork
+[github reaction]: https://github.blog/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/
+[install the recommended extensions]: https://code.visualstudio.com/docs/editor/extension-marketplace#_workspace-recommended-extensions
+[issues page]: https://github.com/MillironX/Kelpie.jl/issues
+[new issue]: https://github.com/MillironX/Kelpie.jl/issues/new/choose
+[visual studio code]: https://code.visualstudio.com