📝 Added README

README.md

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+# ⚠ Houston
+
+> RFC 7807 compliant errors for Node.js
+
+[![npm](https://img.shields.io/npm/v/moducate/houston)](https://npmjs.com/package/moducate/houston)
+[![Code Climate maintainability](https://img.shields.io/codeclimate/maintainabilitymoducate/houston)](https://codeclimate.com/github/moducate/houston)
+[![npms.io (quality)](https://img.shields.io/npms-io/final-score/moducate/houston?label=npms.io%20score)](https://api.npms.io/v2/package/moducate/houston)
+[![Snyk Vulnerabilities for npm package](https://img.shields.io/snyk/vulnerabilities/npm/@moducate/houston)](#)
+[![npm bundle size](https://img.shields.io/bundlephobia/minzip/moducate/houston)](https://bundlephobia.com/package/moducate/houston)
+
+- 📃 **Fully compliant.** Fully compliant with the [RFC 7807 specification](https://datatracker.ietf.org/doc/html/rfc7807).
+- 💡 **Lightweight.**
+- 💪 **TypeScript.** Fully typed and self-documenting!
+
+## 🚀 Quick Start
+
+### Install
+
+```bash
+# npm
+npm i @moducate/houston
+
+# or yarn
+yarn add @moducate/houston
+```
+
+### Import
+
+```js
+// ESM / TypeScript
+import { withError } from "@moducate/houston";
+
+// or CommonJS
+const { withError } = require("@moducate/houston");
+```
+
+### Example Usage
+
+Transform an `express` response:
+
+```js
+const { withError } = require("@moducate/houston");
+const app = require("express")();
+
+app.get("/not-found", (_, res) => {
+  return withError(res, { type: "https://example.com/not-found", status: 404 })
+});
+```
+
+## 🏷 MIME Type
+
+The exported `mime` constant can be used to obtain the media/MIME type for RFC 7807 JSON errors.
+
+```js
+const { mime } = require("@moducate/houston");
+
+console.log(mime);
+// => 'application/problem+json'
+```
+
+This is what the `Content-Type` header of the response supplied to `withError` is set to.
+
+## ⚖ License
+
+Houston is licensed under the [`MIT License`](LICENSE).