Issue#3422650: Add readme file.

Closes #3422650

README.md

+# Components!
+
+The Components module makes it easier for a theme to organize its components.
+It allows themes (and modules) to register Twig namespaces and provides some 
+additional Twig functions and filters for use in Drupal templates.
+
+For a full description of the module, visit the
+[project page](https://www.drupal.org/project/components).
+
+Submit bug reports and feature suggestions, or track changes in the
+[issue queue](https://www.drupal.org/project/issues/components?categories=All).
+
+
+## Table of contents
+
+- Features
+- Installation
+- Requirements
+- Configuration
+- Usage
+- Maintainers
+
+
+## Features
+- Offers feature called Template namespaces.
+
+
+## Installation
+
+Install as you would normally install a contributed Drupal module. For further
+information, see
+[Installing Drupal Modules](https://www.drupal.org/docs/extending-drupal/installing-drupal-modules).
+
+
+## Requirements
+
+This module requires no modules outside of Drupal core.
+
+
+## Configuration
+
+This modules doesn't have any configuration. It allows user to add the template
+namespaces.
+
+
+## Maintainers
+
+- John Albin Wilkins - [JohnAlbin](https://www.drupal.org/u/johnalbin)
+- Rob Loach - [RobLoach](https://www.drupal.org/u/robloach)
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