updated README.md

The `csst_proto` uses an awesome algorithm based on `numpy.ndarray` indices to flip images.

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## timeline

| `setup.py`         | sphinx-based documentation      | √√     | √   |     |

## important stages

1. **code**, **code style** & `top_level_interface`

2. **installation**: `source code` & `setup.py` -> `pip install <package_name>`

3. **a simple instruction**: `README.md`

4. **unittest**: `pytest`

5. *gitlab CI/CD pipeline: `.gitlab-ci.yml`

6. *sphinx-based documentation: `doc/` & `readthedocs.yml`

- stage 1:

  - finished main code

  - good code style

  - `top_level_interface` available

- stage 2:

  - finished `setup.py`

  - can be installed with `pip install <package_name/package_link>` from gitlab

- stage 3:

  - finished instruction

  - `README.md`

- stage 4:

  - finished unittest

  - local unit test passed with `pytest`

- stage 5:

  - gitlab CI/CD pipeline available

  - auto unit tests passed with `.gitlab-ci.yml`

- stage 6:

  - *sphinx-based documentation available

  - `doc/`

  - `readthedocs.yml`

## progress

| module name              | stage 1<br>(source code) | stage 2<br>(installation) | stage 3<br>(instruction) | stage 4<br>(unit tests) | stage 5<br>(gitlab pipeline) | stage 6<br>(sphinx doc) |

|--------------------------|--------------------------|---------------------------|--------------------------|-------------------------|------------------------------|-------------------------|

| `csst_proto`             | √                        | √                         | √                        | √                       | √                            | √                       |

| `csst_ms_mbi_instrument` |                          |                           |                          |                         |                              |                         |

| `csst_ms_mbi_distortion` | √                        | √                         | √                        |                         |                              |                         |

| `csst_ms_mbi_position`   |                          |                           |                          |                         |                              |                         |

| `csst_ms_mbi_flux`       |                          |                           |                          |                         |                              |                         |

| `csst_ms_mbi_photometry` |                          |                           |                          |                         |                              |                         |

| ``                       |                          |                           |                          |                         |                              |                         |

| ``                       |                          |                           |                          |                         |                              |                         |

| ``                       |                          |                           |                          |                         |                              |                         |

## useful links

- python packaging user guide: https://packaging.python.org/en/latest/

- restructured text: https://docutils.sourceforge.io/rst.html

- readthedocs: https://readthedocs.io/ or https://rtfd.io/

## `data manager`

## `data manager` for MS MBI

```python

import os