fix(env.example): add openrouter env variables

pilot/.env.example

@@ -1,13 +1,24 @@
-#OPENAI or AZURE
-ENDPOINT=OPENAI
+# OPENAI or AZURE or OPENROUTER
+ENDPOINT=OPENROUTER
+
+OPENAI_ENDPOINT=
 OPENAI_API_KEY=
+
 AZURE_API_KEY=
 AZURE_ENDPOINT=
-#In case of Azure endpoint, change this to your deployed model name
-MODEL_NAME=gpt-4
+
+OPENROUTER_API_KEY=
+OPENROUTER_ENDPOINT=https://openrouter.ai/api/v1/chat/completions
+
+# In case of Azure/OpenRouter endpoint, change this to your deployed model name
+MODEL_NAME=openai/gpt-3.5-turbo-16k
 MAX_TOKENS=8192
+
+# Database
+DATABASE_TYPE=postgres
+
 DB_NAME=gpt-pilot
-DB_HOST=localhost
-DB_PORT=5432
-DB_USER=admin
-DB_PASSWORD=admin
+DB_HOST=
+DB_PORT=
+DB_USER=
+DB_PASSWORD=