docs(readme): add compatibility table (#162)

Signed-off-by: Frazer Smith <[email protected]>

Author: Fdawgs

Readme.md renamed to README.md

@@ -7,6 +7,25 @@
 A plugin for [Fastify](https://fastify.dev/) that adds support for getting raw
 URL information from the request.
 
+## Install
+```
+npm i @fastify/url-data
+```
+
+### Compatibility
+| Plugin version | Fastify version |
+| ---------------|-----------------|
+| `^6.x`         | `^5.x`          |
+| `^5.x`         | `^4.x`          |
+| `^3.x`         | `^3.x`          |
+| `^2.x`         | `^2.x`          |
+| `^2.x`         | `^1.x`          |
+
+
+Please note that if a Fastify version is out of support, then so are the corresponding versions of this plugin
+in the table above.
+See [Fastify's LTS policy](https://github.com/fastify/fastify/blob/main/docs/Reference/LTS.md) for more details.
+
 ## Example
 
 ```js
@@ -32,4 +51,4 @@ fastify.get('/foo', (req, reply) => {
 
 ## License
 
-Licensed under [MIT](./LICENSE)
+Licensed under [MIT](./LICENSE).