docs(roadmap): add initial roadmap

Author: jeffbcross

ROADMAP.md

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+# Angular Mobile Roadmap
+
+This is a rough view of the roadmap for Angular Mobile Toolkit.
+Angular Mobile Toolkit is an unusual project, in that its tools
+span several projects, implementations, and partners.
+It's better to consider Angular Mobile as an initiative to help drive
+the state of the art of mobile development with Angular 2, with
+some of its own first-class tools.
+
+This roadmap is primarily concerned with the tools under the
+Angular Mobile Toolkit, with some information about corresponding
+efforts in other projects like Universal, Angular Core, Ionic, NgRx,
+AngularFire etc.
+
+## Stages
+
+Our roadmap is composed of milestones that are focused on some cohesive goal,
+with a list of deliverables for each milestone. For the active milestone,
+each deliverable includes a label indicating its current stage of development.
+
+Here are what the stages mean:
+
+ * **Stage 0:** Not started
+ * **Stage 1:** Design has consensus
+ * **Stage 2:** Started
+ * **Stage 3:** Feature implemented and published. Ideally integrated with Angular CLI.
+ * **Stage 4:** Good e2e+unit test coverage. Feature has been dogfooded by one developer not on the Angular Mobile team. Feature is testable and debuggable by developer users.
+ * **Stage 5:** Released to npm or equivalent. Well-documented on mobile.angular.io or equivalent. Verified/accepted by one stakeholder in the feature as adequately solving a real problem.
+ * **Stage 6:** Used in production in a real, non-demo app.
+
+A milestone can be considered complete when all of its deliverables are at at least stage 5.
+
+## Milestones
+
+### Milestone 1: Progressive Web Apps Foundation
+
+ Estimated Completion: July 2016
+
+ * App Shell universal plugin to generate App Shell with CLI with --mobile
+  * Stage 3
+  * [Guide](https://mobile.angular.io/guides/app-shell.html)
+  * [Implementation](https://github.com/angular/universal/tree/master/modules/broccoli-prerender)
+ * App Shell library provides directives and providers to show/hide content
+  * Stage 5
+  * [Design](https://github.com/angular/mobile-toolkit/issues/12)
+  * [Guide](https://mobile.angular.io/guides/app-shell.html)
+  * [Implementation](https://github.com/angular/mobile-toolkit/tree/master/app-shell/src/app)
+ * App Shell library parsing fully pre-rendered page to extrapolate app shell
+  * Stage 2
+  * [Design](https://github.com/angular/mobile-toolkit/issues/12)
+  * [Implementation](https://github.com/angular/mobile-toolkit/tree/master/app-shell/src/app/shell-parser)
+ * Web App Manifest generation incorporated into CLI with --mobile
+  * Stage 4
+  * [Guide](https://mobile.angular.io/guides/web-app-manifest.html)
+  * [Implementation](https://github.com/angular/angular-cli/tree/master/addon/ng2/blueprints/mobile)
+ * Service Worker static asset pre-caching and offline support
+  * Stage 3
+  * [Guide](https://mobile.angular.io/guides/service-worker.html)
+  * [Implementation](https://github.com/angular/mobile-toolkit/tree/master/service-worker/worker)
+ * Service Worker script automatically generated by CLI with --mobile
+  * Stage 4
+  * [Implementation](https://github.com/angular/angular-cli/blob/master/lib/broccoli/angular2-app.js)
+ * Service Worker user-visible push notifications
+  * Stage 0
+ * End-to-end testing tooling for Service Worker
+  * Stage 2
+
+
+### Milestone 2: More Caching!
+ * Self-updating Service-Worker
+ * Service Worker Debugging
+ * Service Worker dynamic data caching w/various strategies
+ * General-purpose cache hydration protocol in Universal
+ * Easy to write Web Worker services that interact with DOM
+ * Explore: make touch event bindings simple and native-like
+
+
+### Milestone 3: Plumbing
+ * Service Worker HTTP/2-push-aware code loading protocol
+ * Service Worker HTTP/-delta pushing and expanding to urls+modules
+ * App serving and loading guidance (HTTP/2, http2-push, sw+http2, compression, route sharding)
+