TF-1074 Add adr for organize root path in app

docs/adr/0018-organize-root-path-in-application.md

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+# 18. Organize root path in application
+
+Date: 2022-10-26
+
+## Status
+
+Accepted
+
+## Context
+
+Root path has differences between different platforms.
+
+## Decision
+
+Reorganized root paths to easily manage and navigate screens within the app:
+
+- `AppRoutes`: Contains screen destination routes that you can navigate across platforms by calling
+`Navigator.push` or type `path` in your browser's address bar
+- `AppPages`: Contains the views or pages of the corresponding route of each screen in the application. 
+When we call `Navigator.push` or type `path` in your browser's address bar, 
+the views/pages will be displayed corresponding to the selected route.
+
+## Consequences
+
+- Navigate correctly to the screen when typing `path` in the browser address bar.
+- Works well across platforms