feat(add): linkedin provider docs (#15)

* add instructions for discord

* add LinkedIn provider guide

* Update meta.js

* Update meta.js

---------

Co-authored-by: odeta939 <[email protected]>
Co-authored-by: Balázs Orbán <[email protected]>

Author: 3 people

lib/meta.js

@@ -110,7 +110,21 @@ export const providers = {
   kakao: { name: "Kakao", setupUrl: undefined },
   keycloak: { name: "Keycloak", setupUrl: undefined },
   line: { name: "Line", setupUrl: undefined },
-  linkedin: { name: "LinkedIn", setupUrl: undefined },
+  linkedin: {
+    name: "LinkedIn",
+    setupUrl: "https://linkedin.com/developers/apps",
+    instructions: `\
+      1. Click on *Create app*
+      2. Set *App name* (can be anything)
+      3. Create a *LinkedIn page*
+      4. Set *LinkedIn Page URL* (LinkedIn page you created)
+      5. Set *App logo* (can be anything)
+      6. Navigate to *Auth* in the top menu
+      7. Set *Authorized redirect URLs for your app* (paste the callback URI on your clipboard)
+      8. Copy and paste the *Client ID*
+      9. Copy and paste the *Primary Client Secret*
+      `,
+  },
   mailchimp: { name: "Mailchimp", setupUrl: undefined },
   mailru: { name: "Mail.ru", setupUrl: undefined },
   mastodon: { name: "Mastodon", setupUrl: undefined },