added openAPI model definitions

TOSCA/openAPI/definitions.yml

+definitions:
+  User:
+    type: "object"
+    properties:
+      id:
+        type: "integer"
+        format: "int64"
+      username:
+        type: "string"
+      firstName:
+        type: "string"
+      lastName:
+        type: "string"
+      email:
+        type: "string"
+      password:
+        type: "string"
+      userStatus:
+        type: "integer"
+        format: "int32"
+        description: "User Status"
+  ToscaTemplate:
+    type: "object"
+    properties:
+      tosca_definitions_version:
+        type: "string"
+      tosca_default_namespace:
+        type: "string"
+      template_name:
+        type: "string"
+      imports:
+        type: "array"
+        items:
+          type: object
+          additionalProperties:
+            type: string
+      repositories:
+        type: object
+        additionalProperties:
+          type: string     
+      dsl_definitions:
+        type: object
+        additionalProperties:
+          type: string      
+      node_types:
+        type: object
+        additionalProperties:
+          type: object     
+      topology_template:
+        $ref: "#/definitions/TopologyTemplate"
+      relationship_types:
+        type: object
+        additionalProperties:
+          type: object    
+      relationship_templates:
+        type: object
+        additionalProperties:
+          type: object      
+      capability_types:
+        type: object
+        additionalProperties:
+          type: object      
+      artifact_types:
+        type: object
+        additionalProperties:
+          type: object        
+      data_types:
+        type: object
+        additionalProperties:
+          type: object 
+      interface_types:
+        type: object
+        additionalProperties:
+          type: object     
+      policy_types:
+        type: object
+        additionalProperties:
+          type: string  
+      group_types:
+        type: object
+        additionalProperties:
+          type: object   
+      description:
+        type: "string"
+      template_author:
+        type: "string"
+  TopologyTemplate:
+    type: "object"
+    properties:
+      description:
+        type: "string"
+      inputs:
+        type: "array"
+        items:
+          type: object
+          additionalProperties:
+            type: object
+      policies:
+        type: "array"
+        items:
+          type: object
+          additionalProperties:
+            type: object            
+      outputs:
+        type: "array"
+        items:
+          type: object
+          additionalProperties:
+            type: object       
+      node_templates:
+        type: object
+        additionalProperties:
+          $ref: '#/definitions/NodeTemplate' 
+      relationship_templates:
+        type: object
+        additionalProperties:
+          type: object        
+      groups:
+        type: object
+        additionalProperties:
+          type: object    
+      substitution_mappings:
+        type: object
+        additionalProperties:
+          type: object    
+  NodeTemplate:
+    type: "object"
+    properties:
+      name:
+        type: "string"
+      type:
+        type: "string"      
+      requirements:
+        type: "array"
+        items:
+          type: object
+          additionalProperties:
+            type: object
+      artifacts:
+        type: object
+        additionalProperties:
+          type: object      
+      properties:
+        type: object
+        additionalProperties:
+          type: object   
+      interfaces:
+        type: object
+        additionalProperties:
+          type: object     
+      capabilities:
+        type: object
+        additionalProperties:
+          type: object    
+      workflows:
+        type: object
+        additionalProperties:
+          type: object             
+  Credentials:
+    type: "object"
+    properties:
+      protocol:
+        type: "string"   
+      token_type:
+        type: "string"        
+      token:
+        type: "string"        
+      keys:
+        type: object
+        additionalProperties:
+          type: string    
+      user:
+        type: "string"   
+      cloud_provider_name:
+        type: "string"