add example environmental variables

Author: pawelborkar

.env.example

@@ -0,0 +1,25 @@
+NODE_ENV=development 
+PORT=8000 
+TAG=1.0.4
+
+# Frontend
+VITE_API_URL=http://localhost:8000
+VITE_API_VERSION=v1
+
+# Backend
+API_URL=http://localhost:8000
+API_VERSION=v1
+DATABASE_URL=postgresql://<username>:<password>@<host>:5432/<database_name>
+
+# AWS Services
+AWS_SECRET_ACCESS_KEY=
+AWS_REGION=
+AWS_ACCESS_KEY_ID=
+AWS_BUCKET_NAME=
+AWS_S3_DIR_PATH=
+AWS_SIGNEDURL_EXPIRE_DURATION=600 #10 minutes
+
+#PSQL
+POSTGRES_USER=
+POSTGRES_PASSWORD=
+POSTGRES_DB=