Update readme

README.md

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 # positive-psych-vis
 Understanding of how positive psychology's research papers, authors, and applications fit together remains trapped inside the minds of experts — how do we give novices that sort of perspective on the field's "knowledge landscape"?
+
+## How to use:
+Download repo, then 
+```
+cd ~/Downloads/positive-psych-vis
+```
+or into wherever you've downloaded it.
+Because it relies on requests for JSON files, you've got to launch a local server. Type into the terminal:
+```
+python -m SimpleHTTPServer 8000
+```
+then open your fave browser and find it served to
+```
+localhost:8000
+```
+You're jamming!