Add readme to discordeno package (#4254)

packages/discordeno/README.md

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+# Discordeno
+
+<img align="right" src="https://raw.githubusercontent.com/discordeno/discordeno/main/website/static/img/logo.png" height="150px" />
+
+Discord API library for [Node.JS](https://nodejs.org), [Deno](https://deno.land) & [Bun](https://bun.sh/)
+
+[![Discord](https://img.shields.io/discord/785384884197392384?color=7289da&logo=discord&logoColor=dark)](https://discord.com/invite/5vBgXk3UcZ)
+[![codecov](https://codecov.io/gh/discordeno/discordeno/branch/main/graph/badge.svg?token=SQI9OYJ7AK)](https://codecov.io/gh/discordeno/discordeno)
+![action status](https://github.com/discordeno/discordeno/actions/workflows/lib-check.yml/badge.svg?event=push)
+
+Discordeno is actively maintained to guarantee **excellent performance, latest features, and ease of use.**
+
+- **Simple, Efficient, and Lightweight**: Discordeno is lightweight, simple to use, and adaptable.
+  - By default: No caching.
+- **Functional API**:
+  - The functional API eliminates the challenges of extending built-in classes and inheritance while ensuring overall simple but performant code.
+- **Cross Runtime**: Supports the Node.js, Deno, and Bun runtimes.
+- **Standalone components**: Discordeno offers the option to have practically any component of a bot as a separate
+  piece, including standalone REST, gateways, custom caches, and more.
+- **Flexibility/Scalability:** Remove any properties, if your bot doesn't need them. For instance, remove `Channel.topic` if your bot doesn't require it. You may save GBs of RAM in this way. A few lines of code are all that are needed to accomplish this for any property on any object.
+
+### Custom Cache
+
+Have your cache setup in any way you like. Redis, PGSQL or any cache layer you would like.
+
+## Links
+
+- [Website](https://discordeno.js.org/)
+- [Documentation](https://discordeno.js.org)
+- [Discord](https://discord.com/invite/5vBgXk3UcZ)