mention syntax highlighting files in the docs

README.md

@@ -78,6 +78,9 @@ It's handy to have an emulator (or a real machine perhaps!) to run the programs
 of the [Vice emulator](http://vice-emu.sourceforge.net/)  for the C64 target,
 and the [x16emu emulator](https://github.com/commanderx16/x16-emulator) for the CommanderX16 target.
 
+**Syntax highlighting:** for a few different editors, syntax highlighting definition files are provided.
+Look in the [syntax-files](https://github.com/irmen/prog8/tree/master/syntax-files) directory in the github repository to find them.
+
 
 Example code
 ------------

docs/source/index.rst

@@ -182,6 +182,10 @@ If you're targeting the CommanderX16 instead, there's a choice of the official `
 and the unofficial `box16 <https://github.com/indigodarkwolf/box16>`_  (you can select which one you want to launch
 using the ``-emu`` or ``-emu2`` command line options)
 
+**Syntax highlighting:** for a few different editors, syntax highlighting definition files are provided.
+Look in the `syntax-files <https://github.com/irmen/prog8/tree/master/syntax-files>`_ directory in the github repository to find them.
+
+
 
 .. toctree::
     :maxdepth: 2

docs/source/todo.rst

@@ -4,7 +4,6 @@ TODO
 For next release
 ^^^^^^^^^^^^^^^^
 - ir: asmsub contents remains blank in IR file
-- mention the syntax highlighting files in the readme and the docs, and add note to the IDEA one that it can also be used in Rider
 
 ...
 

syntax-files/IDEA/readme.txt

@@ -1,6 +1,6 @@
-Prog8 syntax highlighting file for IntelliJ IDEA.
+Prog8 syntax highlighting file for IntelliJ IDEA and Jetbrains Rider.
 
-Copy the file Prog8.xml to your IDEA filetypes folder.
+Copy the file Prog8.xml to your IDEA/Rider filetypes folder.
 If this folder doesn't yet exist, simply create it.
 After installing this file, restart the IDEA.