Add contributing.md for Salesforce open-source compliance

Author: jstdon

CONTRIBUTING.md

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+*This is a suggested `CONTRIBUTING.md` file template for use by open sourced Salesforce projects. The main goal of this file is to make clear the intents and expectations that end-users may have regarding this project and how/if to engage with it. Adjust as needed (especially look for `{project_slug}` which refers to the org and repo name of your project) and remove this paragraph before committing to your repo.*
+
+# Contributing Guide For {NAME OF PROJECT}
+
+This page lists the operational governance model of this project, as well as the recommendations and requirements for how to best contribute to {PROJECT}. We strive to obey these as best as possible. As always, thanks for contributing – we hope these guidelines make it easier and shed some light on our approach and processes.
+
+# Governance Model
+> Pick the most appropriate one
+
+## Community Based
+
+The intent and goal of open sourcing this project is to increase the contributor and user base. The governance model is one where new project leads (`admins`) will be added to the project based on their contributions and efforts, a so-called "do-acracy" or "meritocracy" similar to that used by all Apache Software Foundation projects.
+
+> or
+
+## Salesforce Sponsored
+
+The intent and goal of open sourcing this project is to increase the contributor and user base. However, only Salesforce employees will be given `admin` rights and will be the final arbitrars of what contributions are accepted or not.
+
+> or
+
+## Published but not supported
+
+The intent and goal of open sourcing this project is because it may contain useful or interesting code/concepts that we wish to share with the larger open source community. Although occasional work may be done on it, we will not be looking for or soliciting contributions.
+
+# Getting started
+
+Please join the community on {Here list Slack channels, Email lists, Glitter, Discord, etc... links}. Also please make sure to take a look at the project [roadmap](ROADMAP.md) to see where are headed.
+
+# Issues, requests & ideas
+
+Use GitHub Issues page to submit issues, enhancement requests and discuss ideas.
+
+### Bug Reports and Fixes
+-  If you find a bug, please search for it in the [Issues](https://github.com/{project_slug}/issues), and if it isn't already tracked,
+   [create a new issue](https://github.com/{project_slug}/issues/new). Fill out the "Bug Report" section of the issue template. Even if an Issue is closed, feel free to comment and add details, it will still
+   be reviewed.
+-  Issues that have already been identified as a bug (note: able to reproduce) will be labelled `bug`.
+-  If you'd like to submit a fix for a bug, [send a Pull Request](#creating_a_pull_request) and mention the Issue number.
+  -  Include tests that isolate the bug and verifies that it was fixed.
+
+### New Features
+-  If you'd like to add new functionality to this project, describe the problem you want to solve in a [new Issue](https://github.com/{project_slug}/issues/new).
+-  Issues that have been identified as a feature request will be labelled `enhancement`.
+-  If you'd like to implement the new feature, please wait for feedback from the project
+   maintainers before spending too much time writing the code. In some cases, `enhancement`s may
+   not align well with the project objectives at the time.
+
+### Tests, Documentation, Miscellaneous
+-  If you'd like to improve the tests, you want to make the documentation clearer, you have an
+   alternative implementation of something that may have advantages over the way its currently
+   done, or you have any other change, we would be happy to hear about it!
+  -  If its a trivial change, go ahead and [send a Pull Request](#creating_a_pull_request) with the changes you have in mind.
+  -  If not, [open an Issue](https://github.com/{project_slug}/issues/new) to discuss the idea first.
+
+If you're new to our project and looking for some way to make your first contribution, look for
+Issues labelled `good first contribution`.
+
+# Contribution Checklist
+
+- [x] Clean, simple, well styled code
+- [x] Commits should be atomic and messages must be descriptive. Related issues should be mentioned by Issue number.
+- [x] Comments
+  - Module-level & function-level comments.
+  - Comments on complex blocks of code or algorithms (include references to sources).
+- [x] Tests
+  - The test suite, if provided, must be complete and pass
+  - Increase code coverage, not versa.
+  - Use any of our testkits that contains a bunch of testing facilities you would need. For example: `import com.salesforce.op.test._` and borrow inspiration from existing tests.
+- [x] Dependencies
+  - Minimize number of dependencies.
+  - Prefer Apache 2.0, BSD3, MIT, ISC and MPL licenses.
+- [x] Reviews
+  - Changes must be approved via peer code review
+
+# Creating a Pull Request
+
+1. **Ensure the bug/feature was not already reported** by searching on GitHub under Issues.  If none exists, create a new issue so that other contributors can keep track of what you are trying to add/fix and offer suggestions (or let you know if there is already an effort in progress).
+3. **Clone** the forked repo to your machine.
+4. **Create** a new branch to contain your work (e.g. `git br fix-issue-11`)
+4. **Commit** changes to your own branch.
+5. **Push** your work back up to your fork. (e.g. `git push fix-issue-11`)
+6. **Submit** a Pull Request against the `main` branch and refer to the issue(s) you are fixing. Try not to pollute your pull request with unintended changes. Keep it simple and small.
+7. **Sign** the Salesforce CLA (you will be prompted to do so when submitting the Pull Request)
+
+> **NOTE**: Be sure to [sync your fork](https://help.github.com/articles/syncing-a-fork/) before making a pull request.
+
+# Contributor License Agreement ("CLA")
+In order to accept your pull request, we need you to submit a CLA. You only need
+to do this once to work on any of Salesforce's open source projects.
+
+Complete your CLA here: <https://cla.salesforce.com/sign-cla>
+
+# Issues
+We use GitHub issues to track public bugs. Please ensure your description is
+clear and has sufficient instructions to be able to reproduce the issue.
+
+# Code of Conduct
+Please follow our [Code of Conduct](CODE_OF_CONDUCT.md).
+
+# License
+By contributing your code, you agree to license your contribution under the terms of our project [LICENSE](LICENSE.txt) and to sign the [Salesforce CLA](https://cla.salesforce.com/sign-cla)