Installation doc suggestions

[williamhobbs]

After running through the installation, I have a few suggestions that I think could make it more clear for users. I'm not sure if this is the best way to share my suggestions, but hopefully it makes sense.

master...williamhobbs:MATCH-model:master

# Setup the conda environment
-This will install all of the package dependencies needed to run MATCH. Use `cd` to navigate to the directory where your local files are stored (e.g. "GitHub/match_model")
+This will install all of the package dependencies needed to run MATCH. Use `cd` to navigate to the directory where your local files are stored (e.g. "Users/myusername/GitHub/MATCH-model") and create a new environment

+    cd MATCH-model
    conda env create -f environment.yml

You can download the CBC solver executable from https://ampl.com/products/solvers/open-source/

- Once the CBC is downloaded and unzipped, move cbc.exe and coin-license.txt to the "match_model" directory. 
+ Once the CBC is downloaded and unzipped, move cbc.exe and coin-license.txt to the "match_model" (e.g., Users/myusername/GitHub/MATCH-model/match-model") directory.