add MeasurementData for service device data

src/main/kotlin/ltd/hlaeja/library/deviceData/MeasurementData.kt

@@ -0,0 +1,13 @@
+package ltd.hlaeja.library.deviceData
+
+object MeasurementData {
+
+    data class Request(
+        val tags: Map<String, String>,
+        val fields: Map<String, Number>,
+    )
+
+    data class Response(
+        val fields: Map<String, Number>,
+    )
+}