add optional labels for progress-bar

src/shared/models/progress-bar/index.ts

@@ -0,0 +1 @@
+export { ProgressionInterface } from "./progress-bar.model"

src/shared/models/progress-bar/progress-bar.model.ts

@@ -0,0 +1,4 @@
+export interface ProgressionInterface {
+    progression: number,
+    label?: string
+};