Add env.example

env.eample

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+### Rocket.Chat configuration
+
+# Rocket.Chat version
+# see:- https://github.com/RocketChat/Rocket.Chat/releases
+RELEASE=7.1.0
+# MongoDB endpoint (include ?replicaSet= parameter)
+#MONGO_URL=
+# MongoDB endpoint to the local database
+#MONGO_OPLOG_URL=
+# IP to bind the process to
+BIND_IP=127.0.0.1
+# URL used to access your Rocket.Chat instance
+#ROOT_URL=
+# Port Rocket.Chat runs on (in-container)
+#PORT=
+# Port on the host to bind to
+#HOST_PORT=
+
+### MongoDB configuration
+# MongoDB version/image tag
+#MONGODB_VERSION=
+# See:- https://hub.docker.com/r/bitnami/mongodb
+
+### Traefik config (if enabled)
+# Traefik version/image tag
+#TRAEFIK_RELEASE=
+# Domain for https (change ROOT_URL & BIND_IP accordingly)
+DOMAIN=rocketchat.yourdomain.com
+# Email for certificate notifications
+LETSENCRYPT_EMAIL=email@yourdomain.com
+ROOT_URL=https://rocketchat.yourdomain.com