Add template to improve initial information gathered for issue submissions.

Contributed by Cynthia Shang.

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,17 @@
+Please provide the following information when submitting an issue (feature requests or general comments can skip this):
+
+1. pgBackRest version:
+
+2. PostgreSQL version:
+
+3. Operating system/version - if you have more than one server (for example, a database server, a backup host server, one or more standbys), please specify each:
+
+4. Did you install pgBackRest from source or from a package?
+
+5. Please attach the following as applicable:
+    - `pgbackrest.conf` file(s)
+    - `postgresql.conf` settings applicable to pgBackRest (`archive_command`, `archive_mode`, `listen_addresses`, `max_wal_senders`, `wal_level`, `port`)
+    - errors in the postgresql log file before or during the time you experienced the issue
+    - log file in `/var/log/pgbackrest` for the commands run (e.g. `/var/log/pgbackrest/mystanza_backup.log`)
+
+7. Describe the issue:

doc/xml/release.xml

@@ -65,6 +65,16 @@
             </release-core-list>
 
             <release-doc-list>
+                <release-feature-list>
+                    <release-item>
+                        <release-item-contributor-list>
+                            <release-item-contributor id="shang.cynthia"/>
+                        </release-item-contributor-list>
+
+                        <p>Add template to improve initial information gathered for issue submissions.</p>
+                    </release-item>
+                </release-feature-list>
+
                 <release-refactor-list>
                     <release-item>
                         <release-item-contributor-list>