updated how-to-fit-code

The pipeline

------------

A pipeline should have the structure like below.

A pipeline should have the structure like below. (see csst/)

.. code-block:: shell

.. code-block:: python

    from csst.core.processor import CsstProcessor

    class CsstProcDemo(CsstProcessor):

        def prepare(self, **args):

            # prepare the environment

            # for example, if you make use of some third-party software like SEXTRACTOR,

            # do your preparation here.

            pass

        def run(self, CsstData, *args, **kwargs):

            # run your pipeline here

            # make sure that your input data should be a child class instance of CsstData.

            pass

    CsstMscImgL0Proc

    ├── prepare()

    ├── run()

    └── cleanup()

        def cleanup(self, **kwargs):

            # clean up environment

            pass

.. toctree::

   :hidden:

   :caption: How-to contribute

   :caption: How to contribute

   :maxdepth: 2

   csster