add a TODO list

docs/TODO.md

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+# To Do
+
+## Bugs
+
+* deal with anchor issue (repeatedly crawling index.html#about, index.html#contact, etc.)
+  * should only crawl these pages once
+  * but should be included in the links part
+* when sorting links, "uniq" them as well
+
+## Cleanup
+
+* rename Page -> crawlerState
+* helper function to do the whole crawl process
+* document code better
+  * test with godoc
+
+## Features
+
+* some sort of status during crawl?
+* command line options, flag parsing
+* check RFCs on URL character sets, compliance, etc.
+* packagize parts of app