add arg hints to schedulers

monkeytype.txt

@@ -0,0 +1,7 @@
+Gather data via unit tests:
+
+$ monkeytype run -m nose
+
+Then apply types to a file:
+
+$ monkeytype apply anki.sched

monkeytype_config.py

@@ -0,0 +1,9 @@
+from monkeytype.config import DefaultConfig
+from monkeytype.typing import *
+
+class MyConfig(DefaultConfig):
+    def type_rewriter(self):
+        rws = (RemoveEmptyContainers(),RewriteConfigDict(),RewriteLargeUnion(2))
+        return ChainedRewriter(rws)
+
+CONFIG = MyConfig()