Add API Reference for Watcher

This patch set adds API Reference along with some
fixes to documentation. It partially fixes bug #1757423.

Change-Id: I107b4fd5daf40aad63fc13864debbbbc82a9826c

api-ref/source/watcher-api-v1-strategies.inc

@@ -0,0 +1,164 @@
+.. -*- rst -*-
+
+==========
+Strategies
+==========
+
+A ``Strategy`` is an algorithm implementation which is able to find a
+``Solution`` for a given ``Goal``. To get more information about strategies
+that are shipped along with Watcher, visit `strategies page`_.
+
+There may be several potential strategies which are able to achieve the same
+``Goal``. This is why it is possible to configure which specific ``Strategy``
+should be used for each goal.
+
+Some strategies may provide better optimization results but may take more time
+to find an optimal ``Solution``.
+
+.. _`strategies page`: https://docs.openstack.org/watcher/latest/strategies/index.html
+
+List Strategy
+=============
+
+.. rest_method::  GET /v1/strategies
+
+Returns a list of Strategy resources.
+
+Normal response codes: 200
+
+Error codes: 400,401
+
+Request
+-------
+
+.. rest_parameters:: parameters.yaml
+
+   - goal: r_goal
+   - limit: limit
+   - sort_dir: sort_dir
+   - sort_key: sort_key
+
+Response
+--------
+
+.. rest_parameters:: parameters.yaml
+
+    - uuid: uuid
+    - name: strategy_name
+    - display_name: strategy_display_name
+    - goal_name: goal_name
+    - goal_uuid: goal_uuid
+    - links: links
+
+**Example JSON representation of a Strategy:**
+
+.. literalinclude:: samples/strategy-list-response.json
+   :language: javascript
+
+List Strategy Detailed
+======================
+
+.. rest_method::  GET /v1/strategies/detail
+
+Returns a list of Strategy resources with complete details.
+
+Normal response codes: 200
+
+Error codes: 400,401
+
+Request
+-------
+
+.. rest_parameters:: parameters.yaml
+
+   - goal: r_goal
+   - limit: limit
+   - sort_dir: sort_dir
+   - sort_key: sort_key
+
+Response
+--------
+
+.. rest_parameters:: parameters.yaml
+
+    - uuid: uuid
+    - name: strategy_name
+    - display_name: strategy_display_name
+    - parameters_spec: strategy_parameters_spec
+    - goal_name: goal_name
+    - goal_uuid: goal_uuid
+    - links: links
+
+**Example JSON representation of a Strategy:**
+
+.. literalinclude:: samples/strategy-list-detailed-response.json
+   :language: javascript
+
+Show Strategy
+=============
+
+.. rest_method::  GET /v1/strategies/{strategy_ident}
+
+Shows details for a Strategy resource.
+
+Normal response codes: 200
+
+Error codes: 404
+
+Request
+-------
+
+.. rest_parameters:: parameters.yaml
+
+   - strategy_ident: strategy_ident
+
+Response
+--------
+
+.. rest_parameters:: parameters.yaml
+
+    - uuid: uuid
+    - name: strategy_name
+    - display_name: strategy_display_name
+    - parameters_spec: strategy_parameters_spec
+    - goal_name: goal_name
+    - goal_uuid: goal_uuid
+    - links: links
+
+**Example JSON representation of a Strategy:**
+
+.. literalinclude:: samples/strategy-show-response.json
+   :language: javascript
+
+Show Strategy State
+===================
+
+.. rest_method::  GET /v1/strategies/{strategy_ident}/state
+
+Retrieve an information about strategy requirements.
+
+Normal response codes: 200
+
+Error codes: 404
+
+Request
+-------
+
+.. rest_parameters:: parameters.yaml
+
+   - strategy_ident: strategy_ident
+
+Response
+--------
+
+.. rest_parameters:: parameters.yaml
+
+    - state: strategy_check_state
+    - comment: strategy_check_comment
+    - mandatory: strategy_check_mandatory
+    - type: strategy_check_type
+
+**Example JSON representation of a Strategy:**
+
+.. literalinclude:: samples/strategy-state-response.json
+   :language: javascript