maintenance / updated developer notes to aid setup

DEVELOPER.md

@@ -3,9 +3,13 @@
 
 ## Development
 
-### installing tools needed
-
-TODO some commands/packages
+### Recommended setup
+1. Install Eclipse IDE for Eclipse Committers 2024-03
+2. Install CDT
+3. Install JDK 21
+4. Set up Eclipse and PDE launch config to use your JDK 21 install
+5. Import repo as 'Existing Maven Project'
+6. Activate latest target version (in com.googlecode.cppchecklipse.target/)
 
 ### build
 
@@ -17,7 +21,12 @@ TODO command
 
 ### testing plugin in eclipse
 
-TODO write description
+If you have set up everything as recommended above, all you need to do to test locally is to create a run config.
+
+The run config should be an Eclipse Application launch that is set to 'run a product'.
+Under the plug-ins tab you should set it to launch with 'All workspace and enabled target Plug-ins', and click 'validate plug-ins' before running.
+
+With the run config create you should be able to simply press 'run' and test out the plug-in. Note that you will need to set the path to your cppcheck executable in the test environment for the analysis to be able to run.
 
 ## release process