UPDATE: add app readme

forecasting_dashboard_app/README.md

@@ -1 +1,40 @@
-# Streamlit Forecasting Dashboard App:
+# Streamlit Forecasting Dashboard App:
+
+we need here to create multi-page application that holds performance monitoring service of the model, and forecasting service that shows the forecasting, and actual temperature daily.
+
+using [streamlit](https://docs.streamlit.io/get-started/tutorials/create-a-multipage-app), and [ploomber-cloud](https://ploomber.io/), we created multi page streamlit application, and deploy it easly.
+
+to create multi page application, create all secondary pages in sub directory called `pages/`, and the main page must be named `app.py` to follow ploomber cloud instructions, like the following
+```shell
+# application file structure
+.
+|-- README.md
+|-- app.py
+|-- pages
+|   |-- monitoring_service.py
+|   `-- weather_forecasting_service.py
+|-- ploomber-cloud.json
+|-- requirements.txt
+`-- serve
+    |-- monitoring.py
+    `-- weather_forecasting.py
+```
+
+to deploy the application:
+
+- create ploomber cloud account, and create API key.
+- first set API key using
+```shell
+ploomber-cloud key <API-key>
+```
+- intialize it
+```shell
+ploomber-cloud init
+```
+- you will be asked to choose project type
+- to deploy your application 
+```shell
+ploomber-cloud deploy
+```
+
+to trigger, and refresh the application use Github actions [refresh-dashboard](../.github/workflows/refresh_dashboard.yml)