Adding user guide section about gaze analysis pipeline modules.

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+AOI matchers
+============
+
+ArGaze provides ready-to-use AOI matching algorithms.
+
+Here are JSON samples to include the chosen module inside [ArLayer configuration](../ar_layer_configuration_and_execution.md) *aoi_matcher* entry.
+
+## Deviation circle coverage
+
+```json
+"DeviationCircleCoverage": {
+	"coverage_threshold": 0.5
+}
+```
+
+[See in code reference](../../../argaze.md/#argaze.GazeAnalysis.DeviationCircleCoverage.AOIMatcher)
+
+## Focus point inside
+
+```json
+"FocusPointInside": {}
+```
+
+[See in code reference](../../../argaze.md/#argaze.GazeAnalysis.FocusPointInside.AOIMatcher)