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.

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

release-notes.d/README.md

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+# 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 `release-notes.yaml` with the corresponding latest release ID for the target stream.
+
+Release notes will be organized according to the origin of the change, i.e. the project name. Otherwise miscellaneous changes will be stored under `miscellaneous`. Therefore, the schema of each yaml snippet is designed as follows:
+
+```yaml
+# Each yaml file consists of a list of dictionaries which looks like this
+- component (required): [Custom Project Name] | miscellaneous
+  subject (required): xxx
+  body (optional): xxxxx
+```
+
+An example `release-notes.yaml`:
+```
+- 32.20200715.3.0:
+    coreos-assembler:
+      - subject: add a new sub-command that automates xxx
+      - subject: fix a bug that result in https://github.com/coreos/fedora-coreos-tracker/issues/xxx
+    miscellaneous:
+      - subject: introduce a new config file to facilitate xxx workflow
+        body: the config file as described in https://github.com/coreos/fedora-coreos-tracker/issues/xxx helps users to monitor xxx
+- 32.20200706.3.0:
+    afterburn:
+      - subject: add support for platform xxx
+- 32.20200620.1.0:
+    ignition:
+      - subject: fix a minor issue https://github.com/coreos/fedora-coreos-tracker/issues/xxx
+...
+```
+
+[1] https://github.com/coreos/fedora-coreos-releng-automation

release-notes.d/example.yaml

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+# Each list item should be a dictionary with structure:
+# - component (required): [Custom Project Name] | miscellaneous
+#   subject (required): xxx
+#   body (optional): xxx
+#
+# For example:
+# - component: coreos-installer
+#   subject: Retired the xxx sub-command
+#   body: The sub-command was constantly causing xxx failure (https://github.com/coreos/fedora-coreos-tracker/issues/ISSUE_NUMBER)
+# - component: miscellaneous
+#   subject: Added package abc as per (https://github.com/coreos/fedora-coreos-tracker/issues/ISSUE_NUMBER)
+- component: ""
+  subject: ""
+  body: ""