Add more information

Author: Chi-EEE

app/backend/README.md

@@ -12,6 +12,11 @@ Run the following command to build the sub-project:
 xmake build backend
 ```
 
+## How to use
+
+Url: `localhost:8848/#/room/example` - the room url, the website will create a room.
+Url: `localhost:8848/#/` - the base url, the page will list the rooms.
+
 ## Main Technologies
 
 - C++17

app/frontend/README.md

@@ -12,6 +12,8 @@ Run the following command to build the sub-project:
 pnpm run build
 ```
 
+This process is not necessary as this sub-project is automatically built when running the `backend` sub-project.
+
 ## Main Technologies
 
 - [Svelte](https://svelte.dev/)

app/raspberry_pi/README.md

@@ -17,6 +17,10 @@ Run the following command to build the sub-project:
 xmake build raspberry_pi
 ```
 
+To connect the Raspberry Pi to the backend, you would need the `IPv4 Address` of your Computer/Server and change the host to the value in `IPv4 Address`.
+
+If this doesn't work, you may need to restart your Computer/Server.
+
 ## Main Technologies
 
 - C++17