Add with-clerk example folder

Author: SokratisVidros

examples/with-clerk/README.md

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+# With Clerk.dev
+
+![Clerk.dev](./clerk-logo.png)
+
+Check out the official [clerk-nextjs-starter](https://github.com/clerkinc/clerk-nextjs-starter) repository on how to use [Clerk.dev](https://www.clerk.dev/?utm_source=github&utm_medium=nextjs-examples&utm_campaign=nextjs) with Next.js.
+
+The example shows how to add sign up, sign in, and profile management to your application in minutes.