incomplete first draft. committed for checking the markup in github.

doc/github-development-workflow.md

+# Outline of the GitHub Development Workflow
+
+This purpose of this document is to provide a point of reference for the
+core LAMMPS developers and other LAMMPS contibutors to understand the
+choices the LAMMPS developers have agreed on. Git and GitHub provide the
+tools, but do not set policies, so it is up to the developers to come to
+an agreement as to how to define and interpret policies. This document
+is likely to change as our experiences and needs change and we try to
+adapt accordingly. Last change 2018-11-15.
+
+## Table of Contents
+
+  * [GitHub Merge Management](#github-merge-management)
+  * [Pull Requests](#pull-requests)
+    * [Pull Request Assignments](#pull-request-assignments)
+    * [Pull Request Reviews](#pull-request-reviews)
+    * [Pull Request Discussions](#pull-request-discussions)
+    * [Checklist for Pull Requests](#checklist-for-pull-requests)
+  * [GitHub Issues](#github-issues)
+    * [Feature Request Issues](#feature-request-issues)
+    * [Bug Report Issues](#bug-report-issues)
+  * [Milestones and Release Planning](#milestones-and-release-planning)
+
+## GitHub Merge Management
+
+In the interest of consistency, ONLY ONE of the core LAMMPS developers
+should doing the merging itself.  This is currently @akohlmey (Axel
+Kohlmeyer).  If this assignment needs to be changed, it shall be done
+right after a stable release.
+
+## Pull Requests
+
+ALL changes to the LAMMPS code and documentation, however trivial, MUST
+be submitted as a pull request to GitHub. All changes to the "master"
+branch must be made exclusively through merging pull requests. The
+"unstable" and "stable" branches are only to be updated upon patch or
+stable releases with fast-forward merges based on the associated
+tags. Pull requests may also be submitted to (long-running) feature
+branches created by LAMMPS developers inside the LAMMPS project, if
+needed. Those are not subject to the merge and review restrictions
+discussed in this document, though.
+
+### Pull Request Assignments
+
+Pull requests can be "chaperoned" by one of the LAMMPS core developers.
+This is indicated by who the pull request is assigned to. LAMMPS core
+developers can self-assign or they can decide to assign a pull request
+to a different LAMMPS developer. Being assigned to a pull request means,
+that this pull request may need some work and the assignee is tasked to
+determine what this might be needed or not, and may either implement the
+required changes or ask the submitter of the pull request to implement
+them.  Even though, all LAMMPS developers may have write access to pull
+requests (if enabled by the submitter, which is the default), only the
+submitter or the assignee of a pull request may do so.  During this
+period the "work_in_progress" label shall be applied to the pull
+request.  The assignee gets to decide what happens to the pull request
+next, e.g. whether it should be assigned to a different developer for
+additional checks and changes, or is recommended to be merged.  Removing
+the "work_in_progress" label and assigning the pull request to the
+developer tasked with merging signals that a pull request is ready to be
+merged.
+
+### Pull Request Reviews
+
+People can be assigned to review a pull request in two ways:
+  * They can be assigned manually to review a pull request
+    by the submitter or a LAMMPS developer
+  * They can be automatically assigned, because 
+developer
+
+### Pull Request Discussions
+
+### Checklist for Pull Requests
+
+## GitHub Issues
+
+### Feature Request Issues
+
+### Bug Report Issues
+
+## Milestones and Release Planning
+