Add example .env

.env.example

@@ -0,0 +1,23 @@
+PORT=3000
+
+DB_HOST=
+DB_USER=
+DB_PASSWORD=
+
+EMAIL_HOST=
+EMAIL_USERNAME=
+EMAIL_PASSWORD=
+
+CALENDAR_DB=
+
+FEEDBACK_DB=
+FEEDBACK_IP_SALT=
+FEEDBACK_RATE_LIMIT_MAX=5
+FEEDBACK_RATE_LIMIT_WINDOW_MIN=10
+SALESFORCE_ENABLED=false
+SALESFORCE_API_URL=
+SALESFORCE_API_TOKEN=
+
+MEMBER_CREDENTIAL=123
+CHOIR_CREDENTIAL=123
+MANAGEMENT_CREDENTIAL=123