IVGCVSW-5605 Doxygen: Add contribution guide sections

 * Adds a page for contribution guidelines (Uses md guide)
 * Adds a section for contribution guides (Uses md guide)
 * Minor beautification

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: Iafd7e3abf9da660ec21a215afada61a27ce928fc
diff --git a/docs/01_00_software_tools.dox b/docs/01_00_software_tools.dox
index 416e226..9398b83 100644
--- a/docs/01_00_software_tools.dox
+++ b/docs/01_00_software_tools.dox
@@ -11,25 +11,16 @@
 On this page you can find all software tools contained in the Arm NN repository. You will find links to how-to guides and
 other helpful information in each section.
 
-@subpage delegate
-
-@subpage parsers
-
-@subpage md_python_pyarmnn_README
-
-@subpage serializer
-
-@subpage deserializer
-
-@subpage md_src_armnnQuantizer_README
-
-@subpage md_src_armnnConverter_README
-
-@subpage md_tests_ImageCSVFileGenerator_README
-
-@subpage md_tests_ImageTensorGenerator_README
-
-@subpage md_tests_ModelAccuracyTool-Armnn_README
+ - @subpage delegate
+ - @subpage parsers
+ - @subpage md_python_pyarmnn_README
+ - @subpage serializer
+ - @subpage deserializer
+ - @subpage md_src_armnnQuantizer_README
+ - @subpage md_src_armnnConverter_README
+ - @subpage md_tests_ImageCSVFileGenerator_README
+ - @subpage md_tests_ImageTensorGenerator_README
+ - @subpage md_tests_ModelAccuracyTool-Armnn_README
 **/
 }