docs: update admin user creation instructions

AGENTS.md

@@ -37,6 +37,35 @@ EuchreCamp is a Next.js 14+ application for managing Euchre tournaments and trac
 
 ## Common Tasks
 
+### Admin User Creation
+
+To create an admin user, use the provided scripts:
+
+**Option 1: Using Better Auth API (Recommended)**
+```bash
+node scripts/create-admin-via-api.js
+```
+This creates the admin user `david@dhg.lol` with password `adminadmin` using Better Auth's internal API.
+
+**Option 2: Direct Database Creation**
+```bash
+node scripts/create-admin-better-auth.js
+```
+This creates the admin user `david@dhg.lol` with password `admin` directly in the database.
+
+**List All Users:**
+```bash
+node scripts/list-users.js
+```
+
+**Update Admin Password:**
+```bash
+node scripts/update-admin-password.js
+```
+This updates the admin password to `adminadmin`.
+
+**Note:** All scripts currently create the user `david@dhg.lol`. If you need to create a different admin user, you can modify the email in the script or use Better Auth's CLI.
+
 ### Fixing Authentication Issues
 If users are redirected incorrectly or permissions aren't working:
 1. Check if cookie cache is disabled in `src/lib/auth.ts`