Add Secure Agent architecture diagram on AWS - WISCALERTS-29

.gitignore

 .env
 volumes/
 credentials.tf
-*.svg
 *_credentials.tf
 sandbox
 .DS_Store

README.md

@@ -114,6 +114,11 @@ Secure Agent containers are deployed in following tiers in interop/AWS account.
 | test      | us-east-1(N. Virginia)|test.ei.secureagent.doit.wisc.edu |
 | prod      | us-east-2(Ohio)|prod.ei.secureagent.doit.wisc.edu|
 
+### Architecture Diagram
+[diagram]: #architecture-diagram
+![Secure Agent](./IICS-secure-agent-deployment.svg)
+
+The diagram source can be found [here](https://www.lucidchart.com/documents/edit/86359940-c63f-492c-8dd5-606b90525b92/0_0?beaconFlowId=C00A2449A556180D).
 
 ### CI/CD and Terraform
 * Infrastructure is available as code in terraform for `AWS` provider, and [.gitlab-ci.yml](.gitlab-ci.yml) pipeline push the Secure Agent