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Update README.md #5

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Expand Up @@ -13,3 +13,34 @@ This starts a webserver on localhost, allows someone to connect, then connects t

* https://docs.webchartnow.com/resources/system-specifications/fhir-application-programming-interface-api/oauth-2.0-tutorial/
* https://docs.enterprisehealth.com/resources/system-specifications/fhir-application-programming-interface-api/oauth-2.0-tutorial/


## Sequence Diagram

```mermaid
sequenceDiagram
actor U as User
participant N as Node.js Server
participant O as OAuth2 Server (.well-known)

U ->> N: Access Node.js server
N ->> O: Request OpenID configuration (.well-known/openid-configuration)
O -->> N: Return configuration (auth & token endpoints)

N ->> O: Generate login link using authorization endpoint
O -->> N: Send login link back
N ->> U: Show login link to user

U ->> O: User clicks login link (Authorization URL)
O ->> U: Prompt User for Authentication
U -->> O: User Authenticates

O ->> U: Redirect to Node.js Server with Authorization Code
U ->> N: Send Authorization Code to Node.js Server

N ->> O: Exchange Authorization Code for Access Token
O -->> N: Return Access Token

N ->> U: Respond with Access Token or Success Message

```