doc:Moved assumptions from readme to notes

NOTES.md

@@ -1,3 +1,18 @@
+### Assumptions ###
+
+In order to stay lean and fast, Falcon makes several assumptions.
+
+First, Falcon assumes that request handlers will (for the most part) do the right thing. In other words, Falcon doesn't try very hard to protect handler code from itself. 
+
+This requires some discipline on the part of the developer.
+
+1. Request handlers will set response variables to sane values.
+1. The application won't add extra junk to req and resp dicts (use the ctx instead)
+1. Request handlers are well-tested with high code coverage. It's not Falcon's job to babysit your code once it leaves the nest.
+1. ...
+
+### Misc. ###
+
 * Falcon probably isn't thread-safe; don't try it. Run multiple worker processes, each with a non-blocking I/O loop instead.
 * Falcon doesn't officially support Python 3; it's on our TODO list.
 * Falcon is based on byte strings, and does no conversions to UTF-16 (for example). If your app needs to use wide strings, you'll need to do the conversion manually. However, we recommend just keeping everything UTF-8 to avoid writing extra code and spinning CPU cycles.