update readme

Author: emilwidlund

README.md

@@ -4,6 +4,7 @@ This repository hosts a wide array of Polar adapters for your TypeScript framewo
 
 ### Adapters
 
+- [BetterAuth](./packages/polar-betterauth)
 - [Astro](./packages/polar-astro)
 - [Elysia](./packages/polar-elysia)
 - [Express](./packages/polar-express)
@@ -12,4 +13,4 @@ This repository hosts a wide array of Polar adapters for your TypeScript framewo
 - [Next.js](./packages/polar-nextjs)
 - [Nuxt](./packages/polar-nuxt)
 - [Remix](./packages/polar-remix)
-- [Sveltekit](./packages/polar-sveltekit)
+- [Sveltekit](./packages/polar-sveltekit)