Merge pull request optuna#5250 from porink0424/feat/add-web-dashboard…

…-to-docs

Add Optuna Dashboard section to docs

docs/source/index.rst

@@ -79,6 +79,26 @@ optimization *studies*.
     study = optuna.create_study()  # Create a new study.
     study.optimize(objective, n_trials=100)  # Invoke optimization of the objective function.
 
+Web Dashboard
+-------------
+
+`Optuna Dashboard <https://github.com/optuna/optuna-dashboard>`_ is a real-time web dashboard for Optuna.
+You can check the optimization history, hyperparameter importance, etc. in graphs and tables.
+You don't need to create a Python script to call `Optuna's visualization <https://optuna.readthedocs.io/en/stable/reference/visualization/index.html>`_ functions.
+Feature requests and bug reports are welcome!
+
+.. image:: https://user-images.githubusercontent.com/5564044/204975098-95c2cb8c-0fb5-4388-abc4-da32f56cb4e5.gif
+
+``optuna-dashboard`` can be installed via pip:
+
+.. code-block:: console
+
+   $ pip install optuna-dashboard
+
+.. TIP::
+
+   Please check out the `getting started <https://optuna-dashboard.readthedocs.io/en/latest/getting-started.html>`_ section of Optuna Dashboard's official documentation.
+
 Communication
 -------------