Add Dockerfile for Easy Setup

[schourasia750]

As an EmbeddedChat developer,
I need a Dockerfile to automate the setup process.

So that

Developers can quickly set up and run the project without manual dependency installation.

The development environment remains consistent across contributors.
Acceptance Criteria

 Add a Dockerfile using node:16 as the base image.
 Automate yarn install and setup.
 Expose necessary ports (e.g., 3000 for Storybook).
 Ensure it runs yarn storybook or yarn dev.
 Update README with usage instructions.

💡 I’d love to take this up and submit a PR! Let me know if this is good to proceed.

[abirc8010]

Hey @schourasia750 unlike Rocket Chat, EmbeddedChat is not a standalone chat application. Its primary purpose is to be embedded within any website, allowing external developers to configure and customize it to their preferences.
For development purposes, it is presented inside Storybook, So I don't think we need a Docker File.
You can refer to the docs: https://rocketchat.github.io/EmbeddedChat/docs/