feat(docs): First model for swagger

docs/swagger.yaml

@@ -1,3 +1,33 @@
+definitions:
+  models.Contract:
+    properties:
+      runners:
+        items:
+          $ref: '#/definitions/models.Runner'
+        type: array
+    type: object
+  models.Group:
+    properties:
+      id:
+        type: integer
+      name:
+        type: string
+      parent_group:
+        $ref: '#/definitions/models.Group'
+    type: object
+  models.Runner:
+    properties:
+      first_name:
+        type: string
+      group:
+        $ref: '#/definitions/models.Group'
+      id:
+        type: integer
+      last_name:
+        type: string
+      middle_name:
+        type: string
+    type: object
 info:
   contact: {}
   description: This is the API documentation for the LfK Document Server - a tool
@@ -9,6 +39,13 @@ paths:
       consumes:
       - application/json
       description: Generate a contract based on the provided data
+      parameters:
+      - description: Contract data
+        in: body
+        name: data
+        required: true
+        schema:
+          $ref: '#/definitions/models.Contract'
       produces:
       - application/pdf
       responses: {}