Create rfc-admin-guide.md (#165)

Describe what community admins do as part of the RFC process

Author: Edd Wilder-James

governance/rfc-admin-guide.md

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+# Admin guide for RFCs
+
+## Overview
+
+This document describes the process for community managers administering
+TensorFlow RFCs.
+
+|Author                        |Edd Wilder-James [@ewilderj](https://github.com/ewilderj)    |
+:------------------------------|:-----------------------------|
+|Last updated                  |2019-10-21                    |
+
+## RFC Submission Process
+
+### 1. PR is submitted to `tensorflow/community`
+
+When a PR is submitted containing an RFC proposal, check for basic
+formatting concerns.
+
+* The filename should be `rfcs/YYYYMMDD-my-rfc.md` - where YYYYMMDD is the
+  date, and hyphens connect any naming parts. No underscores. No uppercase
+  letters.
+
+* The header block of the RFC should be filled in properly, including the
+  status field set to "Proposed"
+  
+### 2. Conform the RFC title
+
+* In GitHub ensure the PR title is `RFC: The RFC's Title`. Check past PRs to
+  see how they're all consistent.
+
+### 3. Edit the PR description
+
+The description (the first comment on the PR) of every RFC should look the
+  same. They should contain, in order:
+  
+  * When the public review period closes. This is at least two weeks from the
+date of publication.
+
+  * The header table from the RFC showing author, sponsor, date.
+
+  * A summary of what the RFC is about
+
+Here's an example:
+
+<blockquote>
+
+*Comment period is open until 2019-08-28*
+
+# Kernel and Op Implementation and Registration API
+
+| Status        | Proposed                                             |
+:-------------- |:---------------------------------------------------- |
+| **Author(s)** | James Ring ([email protected]), Anna Revinskaya ([email protected]) |
+| **Sponsor**   | Günhan Gülsoy ([email protected])                                  |
+| **Updated**   | 2019-08-14                                                        |
+
+## Objective
+
+Tensorflow (TF) currently provides a C++ API for implementing kernels and ops. The Voltron project aims to create a modular/plugin-based TF implementation with API and ABI surfaces. Plugins will be able to create and register custom kernel and op implementations.
+
+In order to provide a stable ABI, the Voltron team has chosen to provide C APIs to plugin authors. This document introduces the C API for op and kernel registration. For authors who wish to continue using C++ to interface with TensorFlow, an ABI-stable C++ header-only API is provided.
+</blockquote>
+
+### 4. Apply labels
+
+* Apply the `RFC: Proposed` label, and any other appropriate label for the
+  particular area of TensorFlow concerned, e.g. `TFX`.
+  
+### 5. Add the PR to the `RFC Management` project
+
+### 6. In the `RFC Management` project, move from "Needs attention" to "Under review".
+   
+### 7. Publicize the RFC to `[email protected]` and any other community-relevant mailing lists
+   
+Here's a template announcement. Check out the [many examples](https://groups.google.com/a/tensorflow.org/g/developers/search?q=RFC).
+
+<blockquote>
+To: [email protected]<br>
+Subject: [RFC] ACME TensorFlow API<br>
+<br>
+Hi folks,<br><br>
+
+I'm pleased to announce the publication of a new TensorFlow RFC,
+[ACME TensorFlow API](https://github.com/tensorflow/community/pull/162).
+
+The comment period for this RFC is open through YYYY-MM-DD. Comments are
+invited to the [pull request
+linked](https://github.com/tensorflow/community/pull/162). You can view the
+design doc there and also leave your comments inline on the 
+[document source](https://github.com/tensorflow/community/pull/162/files).
+
+**Summary**
+
+The TensorFlow ACME API allows usage of all vintage cartoon characters
+in an agent-based simulation. Wile E Coyote and the Road Runner are 
+default personas, but we also propose the addition of Yosemite Sam
+and Bugs Bunny.
+
+
+Thanks in advance for your feedback!
+</blockquote>
+
+
+## RFC Acceptance Process
+
+When an RFC's comment period is over, a review meeting is usually held.
+(There may be occasions when one is not needed, consult with the RFC author).
+It is the responsibility of the author or sponsor to post the notes from
+that review into a comment on the PR, but you may need to remind them to do
+this.
+
+You can move the RFC into the "Awaiting notes" part of the `RFC Management`
+project to help keep track.
+
+**If the RFC is accepted**, ask the proposer to submit a final update, changing
+the status to Accepted, and adding the RFC number into the header, per
+the template (an RFC's number is the same as the PR number GitHub assigned it.)
+
+Just occasionally you might have to do this yourself: you can edit the
+Markdown in the PR yourself, as a code owner for the repository.
+
+You can then:
+
+* Remove the `RFC: Proposed` label and add the `RFC: Accepted` one
+* Approve and merge the PR.
+
+This should automatically move it to `Accepted PRs` in the `RFC Management`
+project.
+
+**Other possible end-states**
+
+* If revisions are required, note that in the PR comment, keep the PR open but
+  move it to `In Revision` in the `RFC Management` project.
+  
+* If the RFC is abandoned, note that in the comments, close the PR, and move
+  it to the `Not progressed` column in the `RFC Management` project.
+  
+