chore: Add README for new proposed release note process.

docs/release-notes/README.md

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+# Release Notes
+
+We want release notes that are accurate, comprehensive, and written so that
+users of Determined can understand what has changed and what impact it has on
+their use of the product. We also want to spread out the work required to write
+high-quality release notes over time and across the members of the team, rather
+than writing all of the release notes at the last minute as part of cutting a
+new release.
+
+## How To Write Release Notes
+
+* Include an update to the release notes whenever you make a change that should
+  be communicated to users. That includes bug fixes, new features, and
+  improvements to existing features.
+
+* Update the release notes as part of landing the change itself (e.g., in the
+  same PR or as part of a chain of PRs to land a large feature).
+
+* Write the release note entry as a separate file and add it to the
+  `docs/release-notes` directory. Name the file with the PR number as a
+  prefix. For example, `1097-nvidia-a100-support.txt`. The file should be in
+  reStructuredText format and consist of one or more list elements. Be sure to
+  highlight API changes and backward incompatibilities, discuss any steps that
+  must be taken to upgrade safely, and link to other locations in the
+  documentation as needed. For example:
+
+```
+- Add support for provisioning Nvidia A100 GPU instances on GCP.
+
+  - Running workloads on A100 chips currently requires building a custom task
+    environment with CUDA11, because the default task environments provided by
+    Determined contain either CUDA 10.0 or CUDA 10.1. Refer to the
+    :ref:`custom-env` documentation for more details. The default task
+    environments will be upgraded to CUDA11 in a future release of Determined.
+```
+
+* As part of the release process, the release manager will merge these files
+  together into `docs/release-notes.txt`, delete the individual files from
+  `docs/release-notes/`, and then do additional copy-editing and formatting as
+  necessary.