Add example env file

.env.example

@@ -0,0 +1,25 @@
+# Required in all environments
+# Generate with: iex> 32 |> :crypto.strong_rand_bytes() |> Base.encode64()
+CLOAK_ENCRYPTION_KEY=
+
+# Required in production
+DATABASE_PATH=
+BACKGROUND_DATABASE_PATH=
+SECRET_KEY_BASE=
+LOGIN_PASSWORD=
+API_TOKEN=
+
+# Optional (all environments, except test for Last.fm)
+OPENAI_KEY=
+DISCOGS_PERSONAL_ACCESS_TOKEN=
+BRAVE_SEARCH_API_KEY=
+DEFAULT_TIMEZONE=
+LAST_FM_API_KEY=
+LAST_FM_SHARED_SECRET=
+LAST_FM_USER=
+
+# Optional in production
+# PHX_SERVER=true
+# PORT=4000
+# SERVICE_FQDN_WEB=example.com
+# POOL_SIZE=5