update documentation

.env.example

@@ -0,0 +1,28 @@
+# Custom variables initialisation
+# (can overwrite variables present in Makefile.config)
+
+# Application
+# export FLASK_APP=fittrackee
+# export HOST=
+# export PORT=
+# export APP_SETTINGS=fittrackee.config.ProductionConfig
+export APP_SECRET_KEY=
+# export APP_WORKERS=
+export APP_LOG=fittrackee.log
+export UPLOAD_FOLDER=
+
+# Database
+# export DATABASE_URL=postgres://fittrackee:fittrackee@${HOST}:5432/fittrackee
+export DATABASE_DISABLE_POOLING=
+
+# Emails
+export UI_URL=
+export EMAIL_URL=
+export SENDER_EMAIL=
+export REDIS_URL=
+# export WORKERS_PROCESSES=
+
+# Activities
+export TILE_SERVER_URL=
+export MAP_ATTRIBUTION=
+export WEATHER_API_KEY=