Create RELEASE_NOTES.md

Add release note for #52

Author: laeubi

RELEASE_NOTES.md

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+# Eclipse Tycho: Release notes
+
+This page describes the noteworthy improvements provided by each release of Eclipse Tycho.
+
+### Next release...
+
+## 2.4.0
+
+### [Enhanced support for debug output in surefire-tests](https://github.com/eclipse/tycho/issues/52) 
+tycho-surefire now support to set .options files for debugging through the new debugOptions parameter, example: 
+
+```
+<plugin>
+  <groupId>org.eclipse.tycho</groupId>
+  <artifactId>tycho-surefire-plugin</artifactId>
+  <version>${tycho-version}</version>
+  <configuration>
+    <showEclipseLog>true</showEclipseLog>
+    <debugOptions>${project.basedir}/../../debug.options</debugOptions>
+</configuration>
+</plugin>
+  ```