Duplicate Contributing Docs in README for visibility

README.md

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 # All about web components
 
 This repository brought to you by the [Web Components Community Group](https://www.w3.org/community/webcomponents/); the goal being to collect and share documentation and guides for web component best practices.
+
+# Contributor Guidelines
+
+Thank you for your interest in contributing to the [Web Components Community Group](https://www.w3.org/community/webcomponents/)!
+
+Contributions to this repository are intended to become part of documents governed by the:
+
+  * [W3C Patent Policy](https://www.w3.org/Consortium/Patent-Policy-20200915/)
+  * [Software and Document License](https://www.w3.org/Consortium/Legal/copyright-software)
+
+To make substantive contributions to specifications, you must either participate
+in the relevant W3C Working Group or make a non-member patent licensing commitment.
+
+## Issue disclosure and discussion
+
+The first step for any substantive contribution is to either:
+
+  1. [Find an existing issue](https://github.com/w3c/csswg-drafts/issues) directly related to the contribution
+  2. [Add a new issue](https://github.com/w3c/csswg-drafts/issues/new)
+
+Issues are where individual reports and Community Group discussions come together such
+that the eventual consensus can be turned into official language.
+
+## Goals and Non-Goals
+
+The main goal of the Web Components Community Group docs-and-guides effort is to provide explanation, advocacy, and documentation of shared web components concepts in a common location that is not tied to any specific web components library.
+
+This documentation should be ideal for readers interested in learning about web components first - before thinking about libraries; and for web component libraries to reference to cover the standard web components foundations without writing it all themselves.
+
+### Goals
+* Provide a polished landing page for web components, similar in spirit to homepages for frameworks.
+* Explain what web components are and why they are useful
+* Advocate for web components in a library-neutral way
+* Document core web component technical concepts
+* Educate readers on useful library-agnostic patterns and best practices
+* Orient readers to the broader web components ecosystem, including standards work, resources, communities, libraries, tools, and components.
+
+### Non-Goals
+* Duplicate MDN references of the web components APIs
+* Document or advocate specific web components libraries
+
+## Normative and/or substantive contributions
+
+The Web Components Community Group operates via the consensus of its membership, and discusses all significant matters prior to implementation.
+
+Aside from managing issues and PRs on GitHub, the Community Group discusses recommendations, goals, and planning via events available on [this shared calendar](https://calendar.google.com/calendar/u/0/[email protected]).
+
+### Contribution
+
+Please follow the [Pull Request template](https://github.com/w3c/csswg-drafts/blob/master/.github/PULL_REQUEST_TEMPLATE.md) when contributing to the repository.
+
+## Non-substantive contributions
+
+For simple spelling, grammar, or markup fixes unrelated to the substance of a
+specification, issuing a pull request without a corresponding issue is acceptable.