Add an example of the model

Author: ipa-nhg

examples/cognitive_module_image_filter/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>cognitive_module_image_filter</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.xtext.ui.shared.xtextBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.xtext.ui.shared.xtextNature</nature>
+	</natures>
+</projectDescription>

examples/cognitive_module_image_filter/.settings/org.eclipse.core.resources.prefs

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+eclipse.preferences.version=1
+encoding/<project>=UTF-8

examples/cognitive_module_image_filter/ImageFilter.cogmod

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+image_filter:
+  core: image_filter
+  efferent:
+    image_input:
+      topic: "/image_raw"
+      type: "sensor_msgs/msg/Image"
+  afferent:
+    detections:
+      topic: "/detections"
+      type: "sensor_msgs/msg/Image"
+  meta: default_meta
+  coupling: default_coupling