feat: add migrate CLI

docs/manuals/cli/index.md

@@ -18,4 +18,4 @@ commands to streamline your web application development. Here is a list of avail
 - [:material-arrow-right: taipy version](version.md): Obtain the installed Taipy version using this command to keep
   track of the Taipy library's current release.
 
-With these commands, Taipy enables you to develop, manage, and version your web applications easily and efficiently.
+- [:material-arrow-right: taipy migrate](migrate.md): This command allows users of Taipy `version 2.0` to migrate their Taipy entities to `version 3.0` when upgrading Taipy version.

docs/manuals/cli/migrate-entities.md

@@ -0,0 +1,63 @@
+# Migrate entities from earlier versions to Taipy 3.0
+
+Taipy 3.0 provides a CLI option to update entities from older Taipy versions to `3.0`. It
+is recommended to update the Taipy application code to Taipy 3.0 before executing the
+entities migration.
+
+!!! important "Supported Taipy versions"
+
+    The migration supports **Taipy 2.0** or newer.
+
+## Migration arguments
+
+The migrate CLI has one argument, `--repository-type` that accepts 3 values: `filesystem`,
+`sql`, and `mongo`. Each repository type must be succeeded of additional arguments, as
+decribed below:
+
+- *filesystem* must be succeeded by the path to the filesystem folder that holds your Taipy application data. It corresponds to the `storage_folder` attribute in the configuration `CORE` section. If it has not been changed explicitly the value is `.data` inside the application root directory if it has not been provided explicitly.
+- *sql* must be succeeded by the path to the sqlite file that holds your Taipy Application data.
+- *mongo* must be succeded by the credentials to access the mongo database that holds your Taipy Application data. The credentials must follow the order: `host`, `port`, `username` and `password`.
+
+To display the help section of `taipy migrate` CLI, you can run the `taipy help migrate` command.
+Alternatively, you can use the *--help* or *-h* options by running `taipy migrate --help` or `taipy migrate -h`.
+
+```console
+$ taipy help migrate
+usage: taipy migrate [-h] [--repository-type {filesystem,sql,mongo} [{filesystem,sql,mongo} ...]]
+
+optional arguments:
+  -h, --help            show this help message and exit
+  --repository-type {filesystem,sql,mongo} [{filesystem,sql,mongo} ...]
+                        The type of repository to migrate. If filesystem or sql, a path to the database folder/.sqlite file should be informed. In
+                        case of mongo host, port, user and password must be informed, if left empty it is assumed default values
+```
+
+To migrate the entities of an Taipy application with a filesystem repository. We can run the following command:
+
+```console
+$ taipy migrate --repository-type filesystem .data
+``` 
+
+Where `.data` is the path to the directory that holds the Taipy application data.
+
+To migrate the entities of an Taipy application with a sqlite repository. We can run the following command:
+
+```console
+$ taipy migrate --repository-type filesystem ~/taipy.sqlite3
+```
+
+Where  `~/taipy.sqlite3` is the path to the sqlite file that holds the Taipy application data.
+
+To migrate the entities of an Taipy application with a sqlite repository. We can run the following command:
+
+```console
+$ taipy migrate --repository-type mongo localhost 27017 username password
+```
+
+Where the arguments are the credentials to access the mongo database that holds the Taipy application data.
+
+!!! info
+
+    Once executed, the structure of all entities in the repository will be changed to follow
+    the data model of Taipy 3.0. You should see an informative message when the process is
+    done.