Added environment file template

.env.dev

-# This config file contains the environment variables for the application and for the database
-
-# Flask variables
-FLASK_APP=app
-FLASK_RUN_HOST=0.0.0.0
-FLASK_ENV=development
-SECRET_KEY=f9DWPyF70N
-DATABASE_URL=sqlite:///db.sqlite

.env.template

+# This config file contains the environment variables for the application and for the database
+
+# Flask variables
+FLASK_APP=app
+FLASK_RUN_HOST=0.0.0.0
+FLASK_ENV=
+SECRET_KEY=
+DATABASE_URL=
+
+# MariaDB variables (for production only)
+MYSQL_ROOT_PASSWORD=
+MYSQL_DATABASE=toolkit
+MYSQL_USER=flask
+MYSQL_PASSWORD=

.gitignore

 web/app/__pycache__/
 web/app/db.sqlite
 .env.prod
+.env.dev
 .DS_Store