Added more programming documentation resources

Author: pzaino

doc/RISCOSCodingResources.md

@@ -30,6 +30,7 @@ This section is more about software development processes and collaboration with
 * Acorn Archimedes Games developer guide available for free [here](http://riscos.com/support/developers/agrm/index.htm)
 * RISC OS Info, a very useful and rich source of info for developers, you can find it [here](http://www.riscos.info/index.php/Introduction_to_RISC_OS)
 * Useful info about the RISC OS "Nested WindowManager", a must read to understand how to write slightly more "modern-ish" looking desktop Apps on RISC OS, you can find the article [here](http://www.vigay.com/inet/acorn/nested.html)
+* ROOL Collection of DEVELOPER documentation can be foun d[here](https://www.riscosopen.org/wiki/documentation/show/Programmer%20documentation) for free.
 
 **Please Note:** Everyone interested on coding on RISC OS should ALWAYS have a copy of all the **PRM** handy and ready to be used.