feat(demo): add landing page with docs (#1951)

docs/articles/index.md

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+# What is ngx-admin?
+
+ngx-admin is a front-end admin dashboard template based on Angular 7+, Bootstrap 4+ and <a href="https://akveo.github.io/nebular/?utm_source=ngx_admin_landing&utm_medium=docs_getting_started" target="_blank">Nebular</a>. That means all the data you can see on graphs, charts and tables is mocked in Javascript so you can use the backend of your choice with no limitations.
+<hr>
+
+## How can it help me?
+
+We believe that at the moment a lot of business applications have administration/management interfaces inside of them. Sometimes it’s not that obvious, but a lot of web applications have dashboards with panels, charts analytics, etc.
+
+
+ngx-admin aims to bootstrap the development of your product and provide an ecosystem for building production-ready application or prototypes.
+
+Frameworks like Bootstrap provide a number of components, but usually it’s not enough to build a real-world app. This template comes with lots of popular UI components with a unified color scheme, plus it is based on a modern Angular framework and has a flexible component based structure.
+
+You can also use ngx-admin for the purpose of learning Angular.
+<hr>
+
+## List of features
+
+- Angular 7+ & Typescript
+- Bootstrap 4+ & SCSS
+- Responsive layout
+- RTL support
+- High resolution
+- Flexibly configurable themes with **hot-reload** (3 themes included)
+- Authentication module with multiple providers
+- Lots of awesome features:
+  - Buttons
+  - Modals
+  - Popovers
+  - Icons
+  - Typography
+  - Animated searches
+  - Forms
+  - Tabs
+  - Notifications
+  - Tables
+  - Maps
+  - Charts
+  - Editors
+  
+And many more!
+<hr>
+
+## Assumptions
+
+This documentation assumes that you are already familiar with JavaScript/TypeScript, Angular, CSS and Bootstrap.
+
+## Have questions?
+Didn't find something here? Look through the <a href="https://github.com/akveo/ngx-admin/issues" target="_blank">issues</a> or simply drop us a line at <a href="mailto:contact@akveo.com">contact@akveo.com</a>.