Add new ports committer (mce)

Steps for New Committers.
1. Add an Author Entity
2. Update the List of Developers and Contributors
3. Add a News Item
4. Add a PGP Key

Reviewed by: osa, fluffy (mentors)
Approved by: osa, fluffy (mentors)
Differential Revision: https://reviews.freebsd.org/D55853

shared/authors.adoc

@@ -2243,6 +2243,10 @@
 :mbr-email: mbr@FreeBSD.org
 :mbr: {mbr-name} <{mbr-email}>
 
+:mce-name: Kousuke Kannagi
+:mce-email: mce@FreeBSD.org
+:mce: {mce-name} <{mce-email}>
+
 :mckay-name: Stephen McKay
 :mckay-email: mckay@FreeBSD.org
 :mckay: {mckay-name} <{mckay-email}>

shared/contrib-committers.adoc

@@ -160,6 +160,7 @@
 * {kan}
 * {bjk}
 * {phk}
+* {mce}
 * {pkelsey}
 * {yasu}
 * {pkubaj}