Add initial contribution guide content

This includes a summary on the goals of the guide and the project.
The "Getting Started" section links to the head sections this guide
will cover.

GH-12

CONTRIBUTING.md

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+# Contributing to IceCore Hashids
+Thanks for contributing to IceCore Hashids!
+
+The following is a set of guidelines for contributing to IceCore Hashids. Please take a moment to review this document in order to make the contribution process easy and effective for everyone involved.
+
+Following these guidelines helps to communicate that you respect the time of the developers managing and developing this open source project. In return, they should reciprocate that respect in addressing your issue, assessing changes, and helping you finalize your pull requests.
+
+As for everything else in the project, the contributions to IceCore Hashids are governed by our [Code of Conduct](https://github.com/arcticicestudio/icecore-hashids/blob/develop/CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to development@arcticicestudio.com.
+
+## Getting Started
+
+IceCore Hashids is an open source project and we love to receive contributions from the community! There are many ways to contribute, from writing- and improving documentation and tutorials, reporting bugs, submit enhancement suggestions which can be incorporated into IceCore Hashids itself by submitting a pull request.
+
+Before you continue with this contribution guideslines we highly recommend to read the awesome GitHub [Open Source Guide](https://opensource.guide) on how to [making open source contributions][gh-osguide-contribute].
+
+The [GitHub Issues][gh-issues] tracker is the preferred channel for [bug reports](#bug-reports), [enhancement suggestions](#enhancement-suggestions) and [submitting pull requests](#pull-requests). Please keep the discussion on topic and respect the opinions of others.