chore(bitbots_whistle_detector): add resource marker

for the package index of `colcon-ros`

Author: texhnolyze

src/bitbots_misc/bitbots_whistle_detector/resource/bitbots_whistle_detector

@@ -10,6 +10,8 @@
     packages=find_packages(exclude=["test"]),
     data_files=[
         ("share/" + package_name, ["package.xml"]),
+        ("share/ament_index/resource_index/packages", ["resource/" + package_name]),
+        ("share/" + package_name + "/config", glob.glob("config/*.yaml")),
         ("share/" + package_name + "/launch", glob.glob("launch/*.launch")),
     ],
     install_requires=[