Fetch and cache SE sites

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diff --git a/README.md b/README.md
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@@ -1,3 +1,13 @@
 # so
 
 **Note:** under development, not ready for prime time.
+
+### api keys
+According to the [StackExchange
+docs](https://api.stackexchange.com/docs/throttle), most users should be fine
+without generating a personal API key (10k requests per IP per day). If you do
+run into throttling issues, get a key
+[here](https://stackapps.com/apps/oauth/register) and tell `so` to use it:
+```
+so --set-api-key <KEY>
+```