feat: Add closed contribution process

CLOSED_CONTRIBUTIONS.md

@@ -0,0 +1,67 @@
+# Contributing guidelines for closed content
+
+This document describes the process for authoring "closed content", which is content of a sensitive nature that cannot be publicised before release.
+
+Sensitive content might include:
+
+- Security content, including personally identifying information (PII).
+- Content / features that are not yet ready to be announced.
+
+We work in public by default, so this process should only be used on a case by case basis by F5 employees. For standard content releases, review the [Contributing guidelines](/CONTRIBUTING.md)
+
+## Overview
+
+This repository (https://github.com/nginx/documentation) is where we work by default. It has a one-way sync to an internal repository, used for closed content.
+
+The process is as follows:
+
+- Create a branch with the prefix `internal/` in the closed repository
+- Open a pull request in the closed repository to get previews and request feedback
+- Once all stakeholders are happy with changes, close the pull request in the closed repository
+- Push the changes to the open (public) repository by adding the closed repository as a remote
+- Open a new pull request in the open repository, where it can be merged
+
+You can get the URL through our internal communication channels: it will be represented in the following steps as `<closed-URL>`.
+
+To create closed content, first clone the internal repository:
+
+`git clone [email protected]:<closed-url>.git`
+
+Change into this new directory:
+
+`cd <closed-url>`
+
+Check out the `documentation` branch:
+
+`git checkout documentation`
+
+Create a feature branch, **ensuring that you prefix all branch names with `internal/`**:
+
+`git checkout -b internal/feature`
+
+You can then continue on as normal:
+
+```bash
+# Make documentation changes
+git add .
+git commit
+git push
+```
+
+Open a pull request when you are ready to receive feedback from stakeholders.
+
+After any iterative work, close the pull request. Since the closed repository is a mirror of the open one, we do not merge changes to it.
+
+You should instead open a PR in the main repository by adding the closed repository as a remote.
+
+```bash
+git clone [email protected]:nginx/documentation.git
+cd documentation
+git add remote internal [email protected]:<closed-url>.git
+git fetch internal internal/feature
+git checkout -b feature
+git merge internal/internal/feature
+git push origin feature
+```
+
+After the content changes have been merged in the open repository, they will synchronize back to the closed repository.

F5-NGINX-team-notes.md

@@ -1,17 +1,14 @@
 # For F5/NGINX Employees
 
-This repository is a functional mirror. We want to do as much of our work as possible in the
-public repository. However, if you are working with:
+This repository is public, and we do as much of our work as possible in the public as a commitment to open source.
 
-- Security content, including personally identifying information (PII).
-- Content / features that are not yet ready to be announced.
+Before new content is published at https://docs.nginx.com, it must be committed to this `documentation` repository. 
 
-Before new content is published at https://docs.nginx.com, it must be written to this `documentation` repository. After you get approvals in the internal `docs` repository, you'll need to create a _second_ pull request in this open `documentation` repository.
+If you are an F5 employee unable to assign yourself as an owner of an issue or a reviewer of a pull request, ask a member of the NGINX documentation team for help.
 
-If you are unable to assign yourself as an owner of an issue or a reviewer of a pull request, and are an employee of F5, ask a member of the NGINX documentation team for help.
+If your content cannot be publicized before release, it is handled differently: read the [Contributing guidelines for closed content](/CLOSED_CONTRIBUTIONS.md) document.
 
-We encourage you to work with community contributors. If you participate in
-PRs, issues, discussions, and more, follow these guidelines:
+We encourage you to work with community contributors. If you participate in PRs, issues, discussions, and more, follow these guidelines:
 
 - Follow the [Code of Conduct](./CODE_OF_CONDUCT.md).
 - Be helpful. We want to encourage people who contribute to continue.