Merge pull request #374 from Grahack/patch-7

Add a summary to docs/Effects.md

docs/Effects.md

@@ -282,8 +282,14 @@ registered handlers) to which you can return.
 
 ### Summary 
 
-XXX
+The 4 Point Summary
 
+In note form:
+
+1. Event handlers should only return effect declaratively
+2. They return a map like `{:effect1 value1 :effect2 value2}`
+3. Keys of this map can refer to builtin effects handlers (see below) or custom ones
+4. We use `reg-fx` to register our own effects handlers
 
 ### Builtin Effect Handlers