feat: update readme.md

README.md

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 # O-Ring Finder
 
-Straight to the point o-ring size finder tool. visit [this link](https://ijash.github.io/o-ring-finder/) to start using.
+## Table of Contents
+
+- [O-Ring Finder](#o-ring-finder)
+  - [Table of Contents](#table-of-contents)
+  - [Introduction](#introduction)
+  - [Using the Site](#using-the-site)
+  - [Setup and Development](#setup-and-development)
+    - [Prerequisites](#prerequisites)
+    - [Setup](#setup)
+    - [Code Overview](#code-overview)
+    - [Build and Deploy](#build-and-deploy)
+  - [Contributing](#contributing)
+  - [License](#license)
+
+## Introduction
+
+O-Ring Finder is a web tool to help users find the right o-ring size and details. It is built with React and TypeScript, hosted on GitHub Pages.
+
+## Using the Site
+
+1. Visit: [O-Ring Finder](https://ijash.github.io/o-ring-finder/)
+2. Use the input form to filter o-rings.
+3. Click on any row to view detailed o-ring specifications.
+
+## Setup and Development
+
+### Prerequisites
+
+- Node.js v14+
+- npm v6+
+- TypeScript v4+
+- React v18+
+
+### Setup
+
+1. Clone: `git clone https://github.com/ijash/o-ring-finder.git`
+2. Install dependencies: `npm install`
+3. Start development server: `npm start` or `npm run dev`
+
+### Code Overview
+
+- `public`: Static assets and index.html.
+- `src`: Application source code.
+  - `src/components`: React components for the UI:
+    - **Header**: App title and description.
+    - **InputSection**: Form for filtering o-rings.
+    - **TableSection**: Displays filtered o-rings.
+      - **Modal**: Shows o-ring details.
+    - **Footer**: Footer content.
+  - `src/data`: Raw o-ring data and utilities.
+  - `src/css`: CSS/SCSS styles.
+
+### Build and Deploy
+
+1. Build: `npm run build`
+2. Deploy: `npm run deploy`
+
+## Contributing
+
+1. Create a branch: `git checkout -b my-feature`
+2. Make changes and commit: `git commit -m "Add feature"`
+3. Push: `git push origin my-feature`
+4. Open a pull request.
+
+## License
+
+O-Ring Finder is under the [GNU GPLv3](LICENSE).