Add measurement logic

src/backscattering_analyzer/__init__.py

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+from logging import getLogger
+
+logger = getLogger(__name__)

src/backscattering_analyzer/measurement.py

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+from backscattering_analyzer.bench import Bench
+from backscattering_analyzer.package.measurement import (
+    Measurement as Package,
+)
+
+
+class Measurement:
+    def __init__(self, package: Package):
+        self.name = package.metadata.name
+        self.description = package.metadata.description
+        self.injection_power = package.metadata.injection_power
+        self.dark_fringe_power = package.metadata.dark_fringe_power
+
+        self.benches: list[Bench] = []
+        for i in range(len(package.benches)):
+            bench = package.benches[i]
+            mirror = package.mirrors[i]
+            movement = (
+                bench.metadata.factor_calib * bench.signal
+                - mirror.metadata.factor_calib * mirror.signal
+            )
+            self.benches.append(
+                Bench(
+                    name=bench.metadata.name,
+                    fsc=bench.metadata.fsc,
+                    movement=movement,
+                )
+            )
+        self.sensitivity = package.sensitivity

src/backscattering_analyzer/sensitivity.py

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+from gwpy.frequencyseries import FrequencySeries
+
+
+class sensitivity(FrequencySeries):
+    pass