Add .settings folder to .gitignore

- Eclipse 4.24 shows a warning if a project has not got explicit encoding settings
- See https://www.eclipse.org/eclipse/news/4.24/platform.php
- The warning can be removed with an Eclipse quick fix to create a settings file

- But we don't want the settings file in the repo to keep it clean

- A future version of Eclipse will have an option to turn this warning off
- See eclipse-platform/eclipse.platform.resources#166

Author: Phillipus

.gitignore

@@ -1,9 +1,12 @@
 bin/
+.settings/
+
 # Ignore Maven generated folders
 # Although it would be better to copy the source folders first and run Maven on the copy...
 # Which is what I do via an Ant script
 target/
 /workspace/
+
 # Maven generates these *.jar files in the project's root...
 com.archimatetool.canvas.jar
 com.archimatetool.editor.jar