Environment

Hello!

This could be installed simply with command `conda env create -f environment.yml` using the following:

```bash
   name: your_environment
   channels:
     - conda-forge
     - defaults
   dependencies:
     - python=3.8
     - obspy
     - pandas
     - cartopy
     - pip
     - pip:
       - git+https://github.com/LLNL/mttime.git
```

Cheers

Fred