Update README.md

[maxachis]

Current readme file is out of date, and needs updated. Among other things:

• Make sure front-end map is linked DONE
• Updating with new instructions for how to run the data processing. A sentence summarizing the pipeline (first file does this and second file does this, etc.) DONE
• Add one-sentence description of a list of sources for food data. (CHECK FOR CORRECTNESS)
• Update the labels that we use? DONE
• Link to Data prep script source rules (ask Cat for more info on this if confused) DONE

[maxachis]

Sources now added onto readme, but not one-sentence descriptions for them. Not sure what should be added.

[maxachis]

Similarly, need guidance on update labels -- why do we need this, and what would it entail?

[maxachis]

For Update Labels, add section in Readme about the labels we use on the map itself -- indicating whether something accepts SNAP, WIC, etc. And list the specific labels used (7 total).

[maxachis]

@hellonewman Added one-sentence descriptions for food data sources. Ellie, can you look over this and confirm it looks gucci?

[maxachis]

Confirmed it looks gucci. Closing.