Add data layer

projects/common/src/fm/models/data.layer.ts

@@ -0,0 +1,7 @@
+export interface IDataLayer {
+    name: string,
+    unit: string,
+    index: number,
+    indexKey?: string,
+    scale: number,
+  }

projects/common/src/fm/models/json-line.ts

@@ -0,0 +1,5 @@
+export interface IJsonline {
+  time: string;
+  type: string;
+  data: any;
+}

projects/common/src/fm/models/senml-item.ts

@@ -0,0 +1,5 @@
+export interface ISenMLItem {    
+    u?: string;
+    v?: string;
+    n?: string;
+}