add diagram showing system overview

Makefile

@@ -79,3 +79,6 @@ image-gen:
 	docker save $(ALPHA_IMAGE_NAME) | gzip > $(ALPHA_IMAGE_COMPRESSED_FILENAME).tar.gz
 
 .PHONY: test build vet linters install integration image-gen generate-protos generate-golang generate-python generate-ruby clean
+
+doc-images:
+	docker run -v ./:/data plantuml/plantuml "doc"

README.md

@@ -11,6 +11,10 @@ The service handles device connectivity as well as receiving and storing transmi
 
 ## Configuring and running the service
 
+This diagram shows a summary of steps taken during configuration and how the system will operate.
+
+![](doc/system_overview.png)
+
 ### Setup steps
 
 1. Create a third-party application on [developer.tesla.com](https://developer.tesla.com).

doc/system_overview.puml

@@ -0,0 +1,26 @@
+@startuml
+title Fleet Telemetry
+
+== First time only ==
+
+Partner -> "Fleet API": Call register endpoint with CSR
+"Fleet API" -> "Fleet API": Process CSR\n(this will take some time)
+"Fleet API" -> Partner: Email notification
+Partner -> Partner: Setup fleet-telemetry server
+
+== For each user ==
+
+Partner -> Customer: Share the add virtual key to vehicle link\nhttps://tesla.com/_ak/your-domain.com
+Customer -> Vehicle: Click link, add virtual key to vehicle
+note over Partner: Prerequisites:\n- Virtual key on vehicle\n- Firmware version > 2023.20\n- Not a pre-2021 Model S or X
+Partner -> "Fleet API": Configure vehicle request
+"Fleet API" -> Vehicle: Configures vehicle for streaming
+
+== Once vehicle is configured ==
+
+group mTLS Websocket
+Vehicle -> "Fleet Telemetry Server": Data
+end
+"Fleet Telemetry Server" -> "Data Broker": Data
+
+@enduml