Update README.md with new generator info

Author: orderedlist

README.md

@@ -1,2 +1,19 @@
 `script/bootstrap`
 `script/server`
+`open http://localhost:4000`
+
+## Generating the site
+
+While in development, the generator will not clone the nodegit repo. You'll need to soft-link the nodegit repository into `generate/`.
+
+```bash
+ln -s /path/to/nodegit generate/nodegit
+```
+
+Once linked, generate the site.
+
+```bash
+node generate
+```
+
+If you're running `script/server` in another terminal tab, it will read the changes and regenerate the site.