Update README

• Clone only the main branch for end-users

  git clone --depth=1 --branch=master git@codebase.helmholtz.cloud:awi_paleodyn/growth-model-atlantic-cod.git

• regarding LFS (are the data not downloaded correctly? -- could you elaborate on this?)

  Please refactor/remove this part

  Because of the LFS label the .netcdf files in the input_data might not be downloaded by git. Please, check if the input files were downloaded correctly:
  
  ~~~
  $ cd ./input_data/
  $ ncdump -h <file name>.nc
  ~~~ 
  
  If the download via cloning didn't work, you need to download the input_data manually from the repository and replase the content of the cloned input_data folder with it.
  

• Rephrase: "in the root path of the project run poetry install"

  Rest bash commands can be neglected.

  - Build the package with `poetry` 
  
   ~~~
   $ cd growth-model-atlantic-cod
   $ poetry build -f wheel
   $ poetry install
   ~~~

• Add this point to download the submodule git submodule update --init --recursive

• Add a section $ poetry build -f wheel to explain how to install it in any other python env.

• Add poetry run cod-growth-model ./config/base.toml ./output/base_model.csv as an alternative for the example?

• Change Auther name Foerster to Förster

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