Added readme

README.md

@@ -1,19 +1,65 @@
-# Waku Chat POC 
+# Nim Chat POC
 
-This is a project template for vibe coding with Waku in nim. 
+This is a technical proof of consuming the [chat_proto](https://github.com/waku-org/chat_proto/tree/base_types?tab=readme-ov-file) in nim.
 
-The project imports Waku, builds dependencies and links the needed libraries, so you can get to hacking. 
 
-## Getting Started
+## Message Flow
 
-After cloning the repo, initialize the Waku side of the project and run the example code.
+To establish a secure conversation, Saro and Raya need to:
+1. Exchange key material
+2. Agree on a secret key, and location to communicate
 
-`nimble initialize` - Sets up the Waku dependencies
-`nimble run` - Runs and example of using Waku Filter.
+For this technical proof, recipient identity keys are exchanged out of bound via an invite link. More complex identity systems will be explored in the future. 
 
-## Troubleshooting
+Key derivation and message framing is defined by Inbox spec
 
-If it doesn't work and your error is not listed below, please open an issue or PR.
 
-//[Placeholder]
+ ```mermaid
+sequenceDiagram
+    actor S as Saro 
+    participant SI as Saro Inbox 
+    participant C as Convo 
+    participant RI as Raya Inbox 
+    actor R as Raya 
 
+
+    Note over SI,RI: All clients subscribe to their default Inbox
+
+    SI ->> S: Subscribe
+    RI ->> R: Subscribe
+
+    Note over R: Key Information is exchanged OOB 
+    
+    Note over S: Conversation is created
+    C ->> S : Subscribe
+    S ->> RI : Send Invite `I1`
+    S ->> C : Send Message `M1`
+
+    RI --) R : Recv `I1`
+    Note over R: Conversation is joined
+    C ->> R : Subscribe
+    C --) R: Recv `M1`
+
+    R ->> C: Send M2
+    C -->> S: Recv M2
+ ```
+
+## Running
+
+
+
+```
+# Run the default binary
+nimble run
+```
+
+
+## Limitations
+
+1. `.proto` files are included in this repo due to complications in importing nested packages using `?subdir=`. Once resolved there will be a single definition of protocol types.
+1. Currently messages are not sent over the wire. They are simulated using a `TransportMessage`.
+
+
+## License
+
+[MIT](https://choosealicense.com/licenses/mit/)