Add comment about ParseForm and ParseMultipartForm

Author: joeybloggs

README.md

@@ -193,6 +193,10 @@ l.RegisterContext(ContextFunc)
 
 // Register custom handler type, see [util.go](https://github.com/go-playground/lars/blob/master/util.go#L62) for example handler creation
 l.RegisterCustomHandler(interface{}, CustomHandlerFunc)
+
+// Context has 2 methods of which you should be aware of ParseForm and ParseMulipartForm, they just call the default http functions but
+// provide one more additional feature, they copy the URL params to the request Forms variables, just like Query parameters would have been.
+// The functions are for convenience and are totally optional.
 ```
 
 Middleware

doc.go

@@ -156,5 +156,9 @@ Misc
 
 	// Register custom handler type, see util.go https://github.com/go-playground/lars/blob/master/util.go#L62 for example handler creation
 	l.RegisterCustomHandler(interface{}, CustomHandlerFunc)
+
+	// Context has 2 methods of which you should be aware of ParseForm and ParseMulipartForm, they just call the default http functions but
+	// provide one more additional feature, they copy the URL params to the request Forms variables, just like Query parameters would have been.
+	// The functions are for convenience and are totally optional.
 */
 package lars