Add readme.

Readme.md

@@ -0,0 +1,61 @@
+# Polychrom—APCA Contrast Checker Figma Plugin
+
+## How It Works:
+
+- Select a layer or text with a visible solid fill, and Polychrom will display the contrast level between the selection and an automatically detected layer background.
+- Select two layers with solid fills, and Polychrom will indicate the contrast between them.
+- Choose multiple layers, and Polychrom will provide a list of contrasts for each selected layer and its background.
+- Modify the color using the built-in color picker, and Polychrom will instantly adjust the contrast value.
+
+## Features
+
+- Displays the contrast level according to the APCA method.
+- Offers text size recommendations for regular (weight 400) and bold (weight 700) font styles, following the APCA contrast-to-font table.
+- Converts original colors to the OKLCH color model, facilitating easy copying of CSS codes to the clipboard. RGB and HEX formats are also available.
+
+## What is APCA?
+
+The Accessible Perceptual Contrast Algorithm (APCA) is a novel method for calculating and predicting readability contrast. This model is specially optimized for ensuring accessible color visibility on self-illuminated RGB computer displays and devices. It also addresses the requirements of visually impaired users, focusing on improving visual readability.
+
+APCA is a candidate contrast method for the forthcoming WCAG 3 and is concurrently evolving as the APCA Readability Criterion, an independent standard managed by Inclusive Reading Technologies.
+
+Read more: [APCA in a Nutshell](https://git.apcacontrast.com/documentation/APCA_in_a_Nutshell).
+
+## Installation
+
+Clone the repository:
+```bash
+git clone https://github.com/evil-martians/figma-polychrom.git
+```
+
+Navigate to the project directory:
+```bash
+cd figma-polychrom
+```
+
+Install the dependencies:
+```bash
+pnpm install
+```
+
+## Development
+
+Run the development server:
+```bash
+pnpm dev
+```
+
+## Build
+
+Build the plugin:
+```bash
+pnpm build
+```
+
+## Contributing
+
+- Fork the repository.
+- Create a new branch for your feature or bugfix.
+- Make your changes.
+- Push your changes and create a pull request.
+- We appreciate any contributions! Please make sure to test your code and adhere to our coding standards.