Release D doc update

Change-Id: I6b2749e5692cf6af2615ff5aff81ff060a1a25d3
Signed-off-by: zhipengh <huangzhipeng@huawei.com>

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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+=========================================
+OPNFV Parser Danube Overview Doumentation
+=========================================
+
+.. contents::
+   :depth: 3
+   :local:
+
+Introduction
+---------------
+
+In NFV, various templates (such as descriptors, records and so on) are utilized
+to describe the deployment requirements (such as basic VM requirements – vCPU,
+memory, storage, as well as the NFV acceleration management requirement such as
+Huge Pages support, SR-IOV, NUMA affinity, DPDK support etc.),
+the post-instaniation records (such as storage usage report, CPU performance
+report etc.) or other purposes. However in order to make these templates
+adaptable and feasible for purpose like deployment orchestration/automation,
+certain tooling mechanism that provides template translation is necessary.
+
+Project Parser will help to provide such tooling mechanism, by parsing Telecom
+operators’ descriptors/records into TOSCA/CAMP templates and then further
+translate TOSCA/CAMP templates into certain common templates, which could be
+used in IaaS orchestration projects like OpenStack Heat.
+
+Upgrades from Arno
+------------------------
+
+For Release B, Parser offers the following additional capabilities:
+
+* Integration of Heat-Translator Liberty release code. (both heat in-tree code and standalone package are provided)
+
+* Yang2Tosca module which offers the capability to translate yang based
+  scriptors to tosca formate templates. Users could further use Heat-translator
+  module to translate this tosca template to Heat Orchestration template.
+  Yang2Tosca module could be installed seperately after user installed
+  OPNFV B release platform.
+
+* The "parser_new_keywords" document demonstrate a set of keywords concluded by
+  Parser team that need to be supported in tosca to heat translation. However
+  it should be noted that these keywords only serve as a roadmap. We will start
+  from Release C to indicate which specific set of keywords are supported in
+  Parser.
+
+* The "vRNC_tosca_intro" document describes Parser's use case analysis on vRNC scenario.
+  The "example" folder contains examples of tosca-nfv standard and vRNC scenario.
+  See also https://wiki.opnfv.org/parser.
+
+Upgrades from Brumapatra
+-----------------------
+
+For Release C, Parser offers the following additional capabilities:
+
+* Policy2Tosca module which enables policy related fields in tosca could be translated
+  into heat orchestration template correctly. Policy2Tosca module could be installed seperately
+  after user installed OPNFV C release platform.
+
+* Tosca2Heat enhancements which includes a set of feature addons (such as substitution mapping)
+for OpenStack tosca-parser module which is integrated in the OPNFV C release platform. And the
+main details are listed below:
+
+  ** support substitution mapping semantic in tosca-parser:
+    - support parse and validation about substitution mapping definition;
+    - support import nested template;
+    - support deployment a node which is substituted by a template;
+    - support deployment a template alone which has substitution mapping definition.
+
+  ** afinity and anti-affinity support when deploy servers:
+    - tosca.policies.Placement.Colocate;
+    - tosca.policies.Placement.Antilocate;
+
+  ** add validation about input parameters;
+
+  ** add high availability and block volume in compute translation;
+
+  ** add ip output in compute translation;
+
+  ** add deployment a whole vRNC testcase with parser.
+
+* Additional testing support.
+
+Upgrades from Colorado
+----------------------
+
+For Release D, Parser offers the following additional capabilities:
+