restore example env file

frontend/.env.example

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+# Since the ".env" file is gitignored, you can use the ".env.example" file to
+# build a new ".env" file when you clone the repo. Keep this file up-to-date
+# when you add new variables to `.env`.
+
+# This file will be committed to version control, so make sure not to have any
+# secrets in it. If you are cloning this repo, create a copy of this file named
+# ".env" and populate it with your secrets.
+
+# When adding additional environment variables, the schema in "/src/env.js"
+# should be updated accordingly.
+
+# Prisma
+# https://www.prisma.io/docs/reference/database-reference/connection-urls#env
+DATABASE_URL="mysql://root:password@localhost:3306/ntnu-kpro-ai-assistant"
+
+# Next Auth
+# You can generate a new secret on the command line with:
+# openssl rand -base64 32
+# https://next-auth.js.org/configuration/options#secret
+# NEXTAUTH_SECRET=""
+NEXTAUTH_URL="http://localhost:3000"
+
+# Next Auth Discord Provider
+DISCORD_CLIENT_ID=""
+DISCORD_CLIENT_SECRET=""