[Deployment] Setup fly.io deployment method and update docs (#1028)

Co-authored-by: sidmohanty11 <sidmohanty11@gmail.com>

docs/deployment/fly_io.mdx

@@ -0,0 +1,95 @@
+---
+title: 'Fly.io'
+description: 'Deploy your RAG application to fly.io platform'
+---
+
+Embedchain has a nice and simple abstraction on top of the [Fly.io](https://fly.io/) tools to let developers deploy RAG application to fly.io platform seamlessly. 
+
+Follow the instructions given below to deploy your first application quickly:
+
+
+## Step-1: Install flyctl command line
+
+<CodeGroup>
+```bash OSX
+brew install flyctl
+```
+
+```bash Linux
+curl -L https://fly.io/install.sh | sh
+```
+
+```bash Windows
+pwsh -Command "iwr https://fly.io/install.ps1 -useb | iex"
+```
+</CodeGroup>
+
+Once you have installed the fly.io cli tool, signup/login to their platform using the following command:
+
+<CodeGroup>
+```bash Sign up
+fly auth signup
+```
+
+```bash Sign in
+fly auth login
+```
+</CodeGroup>
+
+In case you run into issues, refer to official [fly.io docs](https://fly.io/docs/hands-on/install-flyctl/).
+
+## 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:
+
+```bash Create application
+mkdir my-rag-app
+ec create --template=fly.io
+```
+
+This will generate a directory structure like this:
+
+```bash
+├── Dockerfile
+├── app.py
+├── fly.toml
+├── .env
+├── .env.example
+└── requirements.txt
+```
+
+Feel free to edit the files as required.
+- `Dockerfile`: Defines the steps to setup the application
+- `app.py`: Contains FastAPI app code
+- `fly.toml`: fly.io config file
+- `.env`: Contains environment variables for production
+- `.env.example`: Contains dummy environment variables (can ignore this file)
+- `requirements.txt`: Contains python dependencies for your FastAPI application
+
+## Step-3: Test app locally
+
+You can run the app locally by simply doing:
+
+```bash Run locally
+pip install -r requirements.txt
+ec dev
+```
+
+## Step-4: Deploy to fly.io
+
+You can deploy to fly.io using the following command:
+```bash Deploy app
+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:
+
+You can also check the logs, monitor app status etc on their dashboard by running command `fly dashboard`.
+
+<img src="/images/fly_io.png" />
+
+## Seeking help?
+
+If you run into issues with deployment, please feel free to reach out to us via any of the following methods:
+
+<Snippet file="get-help.mdx" />