readme update

README.md

@@ -14,6 +14,92 @@ cargo build
 cargo run
 ```
 
+## How to interact with the app
+
+### Connect
+
+First, you will need to connect to the app by web socket:
+
+Ex: ```ws://localhost:<$PORT>```
+
+### Send messages
+
+To execute any operation you have to send a json which has the following format:
+
+```json
+{
+    "ty": "Create" | "Join" | "Leave" | "Msg",
+    "data": ""
+}
+```
+
+### Available operations
+
++ #### Create a room: 
+    ```json
+    {
+        "ty": "Create",
+        "data": ""
+    }
+    ```
+    + Response:
+        ```json
+        {
+            "ty": "Info",
+            "data": <room-id>
+        }
+        ```
+
++ #### Join a room: 
+    ```json
+    {
+        "ty": "Join",
+        "data": <room-id>
+    }
+    ```
+    + Response:
+        ```json
+        {
+            "ty": "Info",
+            "data": "Joined"
+        }
+        ```
+
++ #### Leave a room: 
+    ```json
+    {
+        "ty": "Leave",
+        "data": ""
+    }
+    ```
+    + Response:
+        ```json
+        {
+            "ty": "Info",
+            "data": "Room leaved"
+        }
+        ```
+
++ #### Send a msg to the room: 
+    ```json
+    {
+        "ty": "Msg",
+        "data": "Hello, World"
+    }
+    ```
+
+
+### Error responses
+
+If an error occurs, the server will send back a json with the following format:
+
+```json
+{
+    "ty": "Err",
+    "data" <error-message>
+}
+```
+
 ## Todo List
 
 + Add a redis db to store messages & active rooms