Add ADR for using AWS SES

docs/architecture/decisions/0017-ses-email.md

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+# 17. Use AWS SES for email sending
+
+Date: 2022-02-14
+
+## Status
+
+Approved
+
+## Context
+
+Our application needs to be able to send email to applicants for various
+purposes including notifying them that their application has been submitted.
+We need infrastructure for programmatically sending email. Amazon Web Services
+(AWS) provides the Simple Email Service (SES) that can do that. CISA can
+provide access to AWS SES for our application.
+
+## Decision
+
+To use AWS SES to provide programmatic email-sending capability. 
+
+## Consequences
+
+We will be dependent on a manual external process to provision and configure
+our AWS resources through CISA. We already use external network egress for
+Login.gov configuration, so there is no additional network configuration
+needed to be able to access the external AWS SES service. We now have two
+additional secret credentials to manage in our environment for accessing the
+external AWS services.