Propose Scott Seago as a maintainer

Scott Seago has made a lot of contributions to Velero, including in
testing, coding, and design.

Some examples of his contributions include a [design for plugin
improvements](https://github.com/vmware-tanzu/velero/blob/main/design/wait-for-additional-items.md),
[added skip support to
RestoreItemActions](vmware-tanzu#1336),
and [reporting important
issues](vmware-tanzu#2948).

He's also been active in the community meetings for the last few years,
and has had thoughtful feedback.

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

.github/auto_assign.yml

@@ -0,0 +1,15 @@
+addReviewers: true
+addAssignees: author
+
+# Only require 2, random reviewers.
+# TODO expand this to support using reviewGroups
+numberOfReviewers: 2
+
+reviewers:
+  - nrb
+  - ashish-amarnath
+  - carlisia
+  - zubron
+  - dsu-igeek
+  - jenting
+  - sseago

MAINTAINERS.md

@@ -11,7 +11,10 @@
 | Ashish Amarnath | [ashish-amarnath](https://github.com/ashish-amarnath) | [VMware](https://www.github.com/vmware/) |
 | Bridget McErlean | [zubron](https://github.com/zubron) | [VMware](https://www.github.com/vmware/) |
 | Dave Smith-Uchida | [dsu-igeek](https://github.com/dsu-igeek) | [VMware](https://www.github.com/vmware/) |
-| JenTing Hsiao | [jenting](https://github.com/jenting) | [SUSE](https://github.com/SUSE/) 
+| JenTing Hsiao | [jenting](https://github.com/jenting) | [SUSE](https://github.com/SUSE/)
+| Scott Seago | [sseago](https://github.com/sseago) | [OpenShift](https://github.com/openshift)
+
+
 
 ## Emeritus Maintainers
 * Adnan Abdulhussein ([prydonius](https://github.com/prydonius))
@@ -28,3 +31,4 @@
 | Deployment | Carlisia Thompson (carlisia), JenTing Hsiao (jenting) | 
 | Community Management | Jonas Rosland (jonasrosland) |
 | Product Management | Eleanor Millman (eleanor-millman) |
+