Add a working neomutt configuration

neomutt/accounts.sample

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+set imap_user = "<username>@guidepointsecurity.com"
+# set imap_pass = <password>
+
+set smtp_url = "smtps://<username>@guidepointsecurity.com@smtp.gmail.com:465/"
+# set smtp_pass = $imap_pass
+
+set ssl_force_tls = yes
+
+# Pull a copy of this script:
+#     https://github.com/google/gmail-oauth2-tools/blob/master/python/oauth2.py
+# I saved mine as ~/bin/mutt-gmail-oauth2.py
+#
+# Follow their instructions, summarized below
+#
+# Set up a client of type 'Web Application', while signed into gps, here:
+#     https://console.developers.google.com/apis/credentials
+#
+# Authenticate and collect your refresh token with this command
+#   mutt-gmail-oauth2.py --user='<username>@guidepointsecurity.com' \
+#      --client_id='<clientid>' \
+#      --client_secret='<clientsecret>' \
+#      --generate_oauth2_token
+#
+# Then put the pieces together in the below 'refresh_command'
+set imap_authenticators="oauthbearer"
+set imap_oauth_refresh_command="~/bin/mutt-gmail-oauth2.py --quiet\
+    --user='<username>@guidepointsecurity.com'\
+    --client_id='<clientid>'\
+    --client_secret='<clientsecret>'\
+    --refresh_token='<refreshtoken>'"
+
+set smtp_authenticators=${imap_authenticators}
+set smtp_oauth_refresh_command=${imap_oauth_refresh_command}