feat: added linkedin adapter (#100)

* add linkedin adapter

* add linkedin adapter

Author: sahinfalcon

.changeset/ten-pans-invent.md

@@ -0,0 +1,5 @@
+---
+"@openauthjs/openauth": patch
+---
+
+add linkedin adapter

packages/openauth/src/adapter/linkedin.ts

@@ -0,0 +1,12 @@
+import { Oauth2Adapter, type Oauth2WrappedConfig } from "./oauth2.js"
+
+export function LinkedInAdapter(config: Oauth2WrappedConfig) {
+  return Oauth2Adapter({
+    ...config,
+    type: "linkedin",
+    endpoint: {
+      authorization: "https://www.linkedin.com/oauth/v2/authorization",
+      token: "https://www.linkedin.com/oauth/v2/accessToken",
+    },
+  })
+}