Update Pegleg README

This patch set updates Pegleg's minimalistic README,
bringing it better into line with the other Airship
components' README files, by adding more content
and references.

Change-Id: If246a3539c044f2acbd4ed27428f6480ef609d7f

README.md

@@ -1,9 +0,0 @@
-# Pegleg
-
-Pegleg is document aggregator that provides early linting and validations via
-[Deckhand](http://deckhand.readthedocs.io/en/latest/) for documents that can be consumed by UCP. To learn more about UCP
-see [UCP Integration](https://github.com/att-comdev/ucp-integration)
-
-
-## Getting Started
-To get started, see [getting started](https://pegleg.readthedocs.io/en/latest/getting_started.html)

README.rst

@@ -0,0 +1,57 @@
+======
+Pegleg
+======
+
+|Doc Status|
+
+Introduction
+============
+
+Pegleg is a document aggregator that provides early linting and validations via
+`Deckhand`_, a document management micro-service within `Airship`_.
+
+Pegleg supports local and remote `Git`_ repositories. Remote repositories
+can be cloned using a variety of protocols -- HTTP(S) or SSH. Afterward,
+specific revisions within those repositories can be checked out, their
+documents aggregated, linted, and passed to the rest of `Airship`_ for
+orchestration, allowing document authors to manage their site definitions using
+version control.
+
+Find more documentation for Pegleg on `Read the Docs`_.
+
+Core Responsibilities
+=====================
+
+* aggregation - Aggregates all documents required for site deployment across
+  multiple `Git`_ repositories, each of which can be used to maintain separate
+  document sets in isolation
+* linting - Configurable linting checks documents for common syntactical and
+  semantical mistakes
+
+Getting Started
+===============
+
+For more detailed installation and setup information, please refer to the
+`Getting Started`_ guide.
+
+Integration Points
+==================
+
+Pegleg has the following integration points:
+
+  * `Deckhand`_ which provides document revision management, storage and
+    rendering functionality upon which the rest of the `Airship`_ components
+    rely for orchestration of infrastructure provisioning.
+
+Further Reading
+===============
+
+`Airship`_.
+
+.. |Doc Status| image:: https://readthedocs.org/projects/airship-pegleg/badge/?version=latest
+   :target: http://airship-pegleg.readthedocs.io/
+.. _Deckhand: https://airship-deckhand.readthedocs.io
+.. _Airship: https://www.airshipit.org
+.. _Read the Docs:  https://airship-pegleg.readthedocs.io
+.. _Getting Started: https://airship-pegleg.readthedocs.io/en/latest/getting-started.html
+.. _Git: https://git-scm.com/