Added main SOL002 API version

src/SOL002/APIVersion/APIVersion.yaml

+swagger: "2.0"
+info:
+  version: "1.2.0"
+  title: "SOL002 - API version interface"
+  description: >
+    SOL002 - API version Interface
+    IMPORTANT: Please note that this file might be not aligned to the current
+    version of the ETSI Group Specification it refers to and has not been
+    approved by the ETSI NFV ISG. In case of discrepancies the published ETSI
+    Group Specification takes precedence.
+    Please report bugs to https://forge.etsi.org/bugzilla/buglist.cgi?component=Nfv-Openapis
+  license:
+    name: "ETSI Forge copyright notice"
+    url: https://forge.etsi.org/etsi-forge-copyright-notice.txt
+  contact:
+    name: "NFV-SOL WG"
+externalDocs:
+  description: ETSI GS NFV-SOL 002 V2.5.1
+  url: https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/002/02.05.01_60/gs_nfv-sol002v020501p.pdf
+basePath: /{apiName}
+schemes:
+  - http
+  - https
+consumes:
+  - application/json
+produces:
+  - application/json
+paths:
+  ###############################################################################
+  # API Versions                                                                #
+  ###############################################################################
+  '/api-versions':
+    get:
+      summary: Retrieve API version information
+      description: >
+        The GET method reads API version information. This method shall follow the provisions specified in
+        table 4.6.3.3.3.2-1 for request and response data structures, and response codes. URI query parameters are not
+        supported.
+      parameters:
+        - name: Version
+          description: >
+            Version of the API requested to use when responding to this request.
+          in: header
+          required: false
+          type: string
+      responses:
+        200:
+          description: >
+            API version information was read successfully.
+            The response body shall contain 4.4 API version
+            information, as defined in clause 4.4.1.13.
+          schema:
+            $ref: '../../definitions/SOL002SOL003_def.yaml#/definitions/ApiVersionInformation'
+          headers:
+            Content-Type:
+              description: The MIME type of the body of the response.
+              type: string
+              maximum: 1
+              minimum: 1
+            Version:
+              description: The used API version.
+              type: string
+              maximum: 1
+              minimum: 1
+        400: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/400' }
+        401: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/401' }
+        403: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/403' }
+        404: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/404' }
+        405: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/405' }
+        406: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/406' }
+        413: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/413' }
+        414: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/414' }
+        416: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/416' }
+        422: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/422' }
+        429: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/429' }
+        500: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/500' }
+        503: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/503' }
+        504: { $ref: '../../responses/SOL002SOL003_resp.yaml#/responses/504' }