Add an example file for .env setup as well as new env variables.

example.env

@@ -0,0 +1,16 @@
+# Variables for fast-access of production server.
+
+PROD_USER=user
+PROD_NAME=example.com
+PROD_PORT=2222
+
+PROD_GIT_USER=git
+PROD_GIT_HOST=git.example.com
+PROD_GIT_PORT=8080
+
+PROD_DATA_USER=data
+PROD_DATA_HOST=sftp.example.com
+PROD_DATA_PORT=2200
+
+PROG="$(basename -- "${BASH_SOURCE[0]}")"
+echo "'$PROG' completed!"