release-notes.d: initial directory for release note yaml snippets

This directory stores the Fedora CoreOS release note yaml snippets which will be picked up by
`fedora-coreos-releng-automation/coreos-release-note-generator` [1] script to produce the final
`release-notes.yaml` for a release. After `release-notes.yaml` has been generated / updated,
all snippets under `release-notes.d` are expected to be cleaned up for future release notes.

Please name the yaml file with the corresponding project name, e.g. afterburn.yaml, since the project name
is determined by the yaml file name. And the release notes for a specfic version will be sorted by different
project sections on the FCOS download website. For example, in the FCOS download website:

---
32.20200715.3.0:
 - Afterburn: fix a bug that prevents xxx (coreos/fedora-coreos-tracker#789) (details)
 - Ignition: introduce a new feature that improves the yyy workflow (details)
 - coreos-assembler: add a new sub-command that automates zzz (details)
---

_Note_: Clicking on the `details` button will show the body of the release note item.

[1] https://github.com/coreos/fedora-coreos-releng-automation

Related: coreos/fedora-coreos-tracker#194
Signed-off-by: Allen Bai <[email protected]>

Author: Allen Bai

release-notes.d/README

@@ -0,0 +1,21 @@
+# Fedora CoreOS Release Note
+
+This directory stores the Fedora CoreOS release note yaml snippets which will be picked up by
+`fedora-coreos-releng-automation/coreos-release-note-generator` [1] script to produce the final
+`release-notes.yaml` for a release. After `release-notes.yaml` has been generated / updated,
+all snippets under `release-notes.d` are expected to be cleaned up for future release notes.
+
+Please name the yaml file with the corresponding project name, e.g. afterburn.yaml, since the project name
+is determined by the yaml file name. And the release notes for a specfic version will be sorted by different
+project sections on the FCOS download website. For example, in the FCOS download website:
+
+---
+32.20200715.3.0:
+ - Afterburn: fix a bug that prevents xxx (https://github.com/coreos/fedora-coreos-tracker/issues/789) (details)
+ - Ignition: introduce a new feature that improves the yyy workflow (details)
+ - coreos-assembler: add a new sub-command that automates zzz (details)
+---
+
+_Note_: Clicking on the `details` button will show the body of the release note item.
+
+[1] https://github.com/coreos/fedora-coreos-releng-automation

release-notes.d/project-name.yaml

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+# Each list item should be a dictionary with structure:
+# - subject (required): removed package xyz
+#   body (optional): xyz introduced bug which is related to (https://example.com/bug3).
+#
+# For example:
+# - subject: removed package xyz
+#   body: This package was causing problems. Workaround by foo foo foo.
+# - subject: added package abc
+# - subject: fixed [bug3](https://example.com/bug3)
+
+# item 1
+- subject: ""
+  body: ""