turn observation dataframe into matrix

1 | ```
get_obs_matrix(obs_df, model_dates, n_step, n_states)
``` |

`obs_df` |
observation data frame |

`model_dates` |
dates over which you're modeling |

`n_step` |
number of model time steps |

`n_states` |
number of states we're updating in data assimilation routine |

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