Add docs for modal.com deployment (#1029)

docs/deployment/fly_io.mdx

@@ -40,7 +40,11 @@ In case you run into issues, refer to official [fly.io docs](https://fly.io/docs
 
 ## Step-2: Create RAG app
 
-We provide a command line utility called `ec` that inherits the template for `fly.io` platform and help you deploy the app. Follow the instructions to create a fly.io app using the template provided:
+We provide a command line utility called `ec` in embedchain that inherits the template for `fly.io` platform and help you deploy the app. Follow the instructions to create a fly.io app using the template provided:
+
+```bash Install embedchain
+pip install embedchain
+```
 
 ```bash Create application
 mkdir my-rag-app
@@ -55,15 +59,17 @@ This will generate a directory structure like this:
 ├── fly.toml
 ├── .env
 ├── .env.example
+├── embedchain.json
 └── requirements.txt
 ```
 
 Feel free to edit the files as required.
 - `Dockerfile`: Defines the steps to setup the application
-- `app.py`: Contains FastAPI app code
+- `app.py`: Contains API app code
 - `fly.toml`: fly.io config file
 - `.env`: Contains environment variables for production
 - `.env.example`: Contains dummy environment variables (can ignore this file)
+- `embedchain.json`: Contains embedchain specific configuration for deployment (you don't need to configure this)
 - `requirements.txt`: Contains python dependencies for your FastAPI application
 
 ## Step-3: Test app locally
@@ -82,7 +88,7 @@ You can deploy to fly.io using the following command:
 ec deploy
 ```
 
-Once this step finished, it will provide you with the deployment endpoint where you can access the app live. It will look something like this:
+Once this step finished, it will provide you with the deployment endpoint where you can access the app live. It will look something like this (Swagger docs):
 
 You can also check the logs, monitor app status etc on their dashboard by running command `fly dashboard`.