Add README

README.md

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+# Hitomezashi Pattern Generation
+
+Hitomezashi patterns are a form of decorative embroidery used to repair or reinforce clothing. This repository contains a web app to experiment with different kinds of patterns and play around with the shapes that arise.
+
+## Development
+
+You need node.js 18 or newer to run the project. Clone the repository and run:
+
+```bash
+npm install
+npm run dev
+```
+
+## Build
+
+After installing the dependencies (see above), you can build a static version like so:
+
+```bash
+npm run build
+```
+
+The resulting web app will be in the `dist` folder.