Add generated chart and README

README.md

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+# Last.fm Stats
+
+This is a tool I wrote to generate year-end charts and graphs for my listening 
+data in Last.fm. The binary downloads artists listened to and tags associated 
+with each to files. Then I use vega-lite to display charts based on the data.
+
+Right now it just generates this, my top played genres of the year:
+
+![Top Genre Tags Played in 2020](chart.png)
+
+## .env file
+
+Running the downloads requires you set two variables in the environment:
+
+```
+LASTFM_USER=thallada
+LASTFM_API_KEY=<apikey-goes-here>
+```
+
+## Generating chart
+
+I couldn't get `vg2png` to generate a chart that had bars for some reason, but 
+if I copy the JSON from `tags.json` into `"data": { "values": [...] }` and then 
+paste that into the [online editor](https://vega.github.io/editor/) it works.