feat: setup env example

Author: andostronaut

.env.example

@@ -0,0 +1,19 @@
+NEXT_PUBLIC_BASE_URL=
+
+# Clerk
+CLERK_SECRET_KEY=
+CLERK_WEBHOOK_SECRET=
+NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=
+NEXT_PUBLIC_CLERK_REDIRECT_BASE=
+NEXT_PUBLIC_CLERK_SIGN_IN_URL=
+NEXT_PUBLIC_CLERK_SIGN_UP_URL=
+NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY=
+
+# PostgreSQL
+DATABASE_URL=
+
+# Crypto
+CRYPTO_PASSPHRASE=
+
+# JWT
+JWT_EXPIRATION=