New feature request: Replacing OSM Lightweight UI

Change-Id: I60ad7cdd47e1c99d7300d470c3b7993d52058c8a

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+# Replacing OSMLight Weight UI #
+
+## Proposer ##
+Prakash Moorthy (prakash.m@tataelxsi.co.in)
+Rajesh S (rajesh.s@tataelxsi.co.in)
+
+## Type ##
+** New UI  with Single Page Application using Angular 7 for OSM Light Weight UI **
+
+## Target MDG/TF ##
+UI
+
+## Description ##
+Currently the UI is split across multiple entities - OSM Light Weight UI, VIM UI, using tools like
+Graphana for visualizing Prometheus data etc. There is no single UI framework to view all the
+relevant information and data which is also extensible to add data and services from new systems.
+
+Proposing the Single Page Application(SPA) using Angular MVC framework to replace OSM Light Weight
+UI.
+Using modern web platform capabilities we can deliver app-like experiences and can  integrate all
+the third party Services with in the same application (Any vim like Open stack, monitoring like
+prometheus).
+This UI will have the ability to be extensible to add services of any new system in the future
+as well.
+
+Advantage of having  MVC approach in OSM Light Weight UI:
+
+Bringing in current standardized technology like Angular is going to enable more people to
+contribute
+Client and Server modules can be handled independently
+MVC renders test-ability, maintainability and scalability. It also satisfies Single Responsibility
+Principle of SOLID.
+Segregate each part of the program and test that the individual modules by unit testing
+Faster development process
+Ability to provide multiple views
+Support for asynchronous technique
+Modification does not affect the entire model
+
+Impact:
+Entire Python OSM Light Weight UI code can be replaced using Angular MVC framework without any
+worry of regression. The new UI development will happen in a separate repo. Current UI can be
+switched when ready without having any impact on running OSM development work (since UI is
+dependent on the NBI APIs only)
+
+Features:
+Over and above the existing features, we will also bring in first support for OpenStack. Since the
+framework is extensible, we can also bring in support for other VIMs as we go along.
+Metrics from Prometheus
+World class UX design for a elegant B2B experience
+
+## Demo or definition of done ##
+Testing all the existing use cases and flows supported by current UI