Docs: added images to readme

Author: Akalanka47000

README.md

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 React UI library to design and render seat layouts. The library is still under active development and not yet ready for production use until the next major release (v1.0.0).
 
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+  <img width="49.5%" alt="image" src="https://github.com/mezh-hq/react-seat-toolkit/assets/73662613/0e023ffd-b4a2-4724-81f3-3ba74114b9a5">
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 ## Features
 
 - **JSON based**: Define your seat layout using JSON data and retrieve it back as JSON after customization ✓