added documentation

temporary documentation demo:
http://goto.bplaced.net/tw5/5.1.7.html#ResolvePath

core/modules/macros/resolve_path.js

@@ -1,5 +1,5 @@
 /*\
-title: $:/core/modules/macros/resolvePath.js
+title: $:/core/modules/macros/resolvepath.js
 type: application/javascript
 module-type: macro
 
@@ -12,7 +12,7 @@ Resolves a relative path for an absolute rootpath.
 /*global $tw: false */
 "use strict";
 
-exports.name = "resolvePath";
+exports.name = "resolvepath";
 
 exports.params = [
 	{name: "source"},

editions/tw5.com/tiddlers/macros/ResolvePath.tid

@@ -0,0 +1,23 @@
+created: 20150203152000000
+modified: 20150203152000000
+title: ResolvePath
+type: text/vnd.tiddlywiki
+caption: resolvepath
+
+The ''resolvepath'' macro constructs a url for a relative source path with respect to an absolute root path, trailing filenames being cut-off.
+
+! Parameters
+
+|!Position |!Name |!Description |!Default |
+|1st |source |the relative path to be appended| |
+|2nd |root |the absolute path to be appended to | |
+
+! Examples
+
+A trivial example to show how the macro works:
+
+```
+<<resolvepath "./backup" "http://mysite.com/store.php">>
+```
+
+<<resolvepath "./backup" "http://mysite.com/store.php">>