Add level-up documentation - level 10 data generation

docs/source/docs/level-up/intermediate_skills/10_data_generation.rst

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+===========================
+Level 10: Data Generation
+===========================
+
+
+Pre-training of deep learning models for vision tasks can increase model accuracy.
+Training model with the synthetic dataset is one of famouse pre-training approach
+since the manual annotations is quite expensive work.
+
+Base on the `previous research <https://arxiv.org/abs/2103.13023>`_, 
+Datumaro provides a fractal image dataset (FractalDB) generator that can be utilized to pre-train the vision models.
+Learning visual features of FractalDB is known to increase the performance of Vision Transformer (ViT) models.
+Note that a fractal patterns in FractalDB is calculated mathmatically using the interated function system (IFS) with random parameters.
+We thus not need to concern about any privacy issues.
+
+
+.. tab-set::
+
+  .. tab-item:: CLI
+
+    We can generate the synthetic images by the following CLI command:
+
+    .. code-block:: bash
+
+      datum generate -o <path/to/data> --count GEN_IMG_COUNT --shape GEN_IMG_SHAPE
+
+    ``GEN_IMG_COUNT`` is an integer that indicates the number of images to be generated. (e.g. `--count 300`)
+    ``GEN_IMG_SHAPE`` is the shape (width height) of generated images (e.g. `--shape 240 180`)
+
+  .. tab-item:: Python
+
+    With Pthon API, we can generate the synthetic images as below.
+
+    .. code-block:: python
+
+        from datumaro.plugins.synthetic_data import FractalImageGenerator
+
+        FractalImageGenerator(output_dir=<path/to/data>, count=GEN_IMG_COUNT, shape=GEN_IMG_SHAPE).generate_dataset()
+
+    ``GEN_IMG_COUNT`` is an integer that indicates the number of images to be generated. (e.g. `count=300`)
+    ``GEN_IMG_SHAPE`` is a tuple representing the shape of generated images as (width, height) (e.g. `shape=(240, 180))
+
+Congratulations! You complete reading all Datumaro level-up documents for the intermediate skills.