[doc] Add configuration validator proposal document

doc/configuration_validator.rst

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+OPENSTACK DIAGNOSTICS PROPOSAL
+==============================
+
+Overview
+--------
+
+OpenStack cloud operators usually rely on deploymnet tools to configure all the
+platform components correctly and efficiently upfront. However, after initial
+deployment platform configurations and operational conditions start to change.
+We propose a project that allows to analyze OpenStack architecture and diagnose
+existing and potential problems using flexible set of rules.
+
+Mission
+---------
+
+Diagnostics project mission is to **provide OpenStack cloud operators with
+flexible way to inspect, analyze and diagnose architecture of the cloud and
+configuration of components of the platform**.
+
+User Stories
+------------
+
+As a **cloud operator**, I want to be able to automatically extract
+configuration parameters from all OpenStack components to verify their
+correctness, consistency and integrity.
+As a **cloud architect**, I want to make sure that my OpenStack architecture and
+configuration are compliant to 'best practices'.
+As a **cloud operator**, I want automatic diagnostics tool which can tell me
+what problems does my OpenStack architecture and/or configuration have or might
+potentially have (e.g. at scale or if some component or node failed).
+As a **cloud operator**, I want to be able to define rules used to inspect and
+verify configuration of OpenStack components and store them to use for
+verification of future configuration changes.
+
+Requirements
+------------
+
+TBD
+
+Scope
+-----
+
+As an MVP1, we create service that includes:
+
+1. Rules engine with grammatic analysis capabilities
+1. Extensible implementation of rules
+1. REST API for running inspections
+1. Storage back-end implementation for OpenStack platform architecture and
+   configuration data
+
+Assumptions
+-----------
+
+We assume that we must reuse as much as possible from OpenStack Deployment
+program in terms of platform configuration and architecture definitions (i.e.
+TripleO Heat and configuration files templates).
+
+Dependencies
+------------
+
+Design
+------