docs: update lit-connect-modal demo readme

Signed-off-by: sarah z <15064710+sarahzdev@users.noreply.github.com>

apps/demo-lit-connect-modal-next/README.md

@@ -6,14 +6,24 @@ When the function is called, it prompts a wallet selection pop-up in the user's
 
 ## 💻 Getting Started
 
-First, run the development server:
+1. Clone this repo, navigate to the project folder, and install the dependencies:
+
+```bash
+cd apps/demo-lit-connect-modal-next
+
+npm install
+```
+
+2. Create a `.env.local` file and add your WalletConnect project ID. You can get one by visiting [WalletConnect](https://cloud.walletconnect.com/sign-in).
+
+```bash
+NEXT_PUBLIC_WC_PROJECT_ID="<Your WalletConnect Project ID>"
+```
+
+3. Start your development server:
 
 ```bash
 npm run dev
-# or
-yarn dev
-# or
-pnpm dev
 ```
 
-Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+4. Visit [http://localhost:3000](http://localhost:3000) to start playing with the app.