Add missing READMEs

Author: Shinigami92

types/prettier/README.md

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+<p>
+  <a href="https://www.npmjs.com/package/@eslint-types/prettier" target="_blank">
+    <img alt="NPM package" src="https://img.shields.io/npm/v/@eslint-types/prettier.svg">
+  </a>
+  <a href="https://www.npmjs.com/package/@eslint-types/prettier" target="_blank">
+    <img alt="Downloads" src="https://img.shields.io/npm/dt/@eslint-types/prettier.svg">
+  </a>
+  <a href="https://github.com/eslint-types/define-config-plugin-types/blob/main/LICENSE">
+    <img alt="License: MIT" src="https://img.shields.io/github/license/eslint-types/define-config-plugin-types.svg">
+  </a>
+  <a href="https://www.paypal.com/donate?hosted_button_id=L7GY729FBKTZY" target="_blank">
+    <img alt="Donate: PayPal" src="https://img.shields.io/badge/Donate-PayPal-blue.svg">
+  </a>
+</p>
+
+# @eslint-types/prettier
+
+## Install
+
+```sh
+npm install -D @eslint-types/prettier
+```
+
+## Usage
+
+```js
+// @ts-check
+const { defineConfig } = require('eslint-define-config');
+
+/// <reference types="@eslint-types/prettier" />
+
+module.exports = defineConfig({
+  // ...
+});
+```

types/unicorn/README.md

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+<p>
+  <a href="https://www.npmjs.com/package/@eslint-types/unicorn" target="_blank">
+    <img alt="NPM package" src="https://img.shields.io/npm/v/@eslint-types/unicorn.svg">
+  </a>
+  <a href="https://www.npmjs.com/package/@eslint-types/unicorn" target="_blank">
+    <img alt="Downloads" src="https://img.shields.io/npm/dt/@eslint-types/unicorn.svg">
+  </a>
+  <a href="https://github.com/eslint-types/define-config-plugin-types/blob/main/LICENSE">
+    <img alt="License: MIT" src="https://img.shields.io/github/license/eslint-types/define-config-plugin-types.svg">
+  </a>
+  <a href="https://www.paypal.com/donate?hosted_button_id=L7GY729FBKTZY" target="_blank">
+    <img alt="Donate: PayPal" src="https://img.shields.io/badge/Donate-PayPal-blue.svg">
+  </a>
+</p>
+
+# @eslint-types/unicorn
+
+## Install
+
+```sh
+npm install -D @eslint-types/unicorn
+```
+
+## Usage
+
+```js
+// @ts-check
+const { defineConfig } = require('eslint-define-config');
+
+/// <reference types="@eslint-types/unicorn" />
+
+module.exports = defineConfig({
+  // ...
+});
+```