Create a new assignment

{
  "type": "object",
  "properties": {
    "allowsAnonymousContributions": {
      "type": "boolean"
    },
    "callToAction": {
      "type": "string",
      "description": "An optional call to action specific to this assignment. ie. Submit your snow pictures."
    },
    "cover": {
      "type": "object",
      "properties": {
        "artifacts": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "contentLength": {
                "type": "number"
              },
              "contentType": {
                "type": "string"
              },
              "height": {
                "type": "number"
              },
              "label": {
                "type": "string"
              },
              "url": {
                "type": "string"
              },
              "width": {
                "type": "number"
              }
            }
          }
        },
        "id": {
          "type": "string"
        },
        "media": {
          "type": "object",
          "properties": {
            "duration": {
              "type": "number"
            },
            "id": {
              "type": "string"
            },
            "place": {
              "type": "object",
              "properties": {
                "country": {
                  "type": "string"
                },
                "geohash": {
                  "type": "string"
                },
                "google": {
                  "type": "string"
                },
                "latLong": {
                  "type": "object",
                  "properties": {
                    "latitude": {
                      "type": "number",
                      "format": "double"
                    },
                    "longitude": {
                      "type": "number",
                      "format": "double"
                    }
                  }
                },
                "name": {
                  "type": "string"
                },
                "osm": {
                  "type": "object",
                  "properties": {
                    "osmId": {
                      "type": "number"
                    },
                    "osmType": {
                      "type": "string"
                    }
                  }
                }
              }
            },
            "type": {
              "type": "string"
            }
          }
        }
      }
    },
    "created": {
      "type": "string",
      "format": "date-time"
    },
    "description": {
      "type": "string"
    },
    "embargo": {
      "type": "string",
      "format": "date-time"
    },
    "ends": {
      "type": "string",
      "format": "date-time"
    },
    "featured": {
      "type": "boolean"
    },
    "id": {
      "type": "string"
    },
    "mediaRequired": {
      "type": "boolean"
    },
    "moderator": {
      "type": "string",
      "description": "Optional credential id of the moderator who owns this particular assignment."
    },
    "name": {
      "type": "string"
    },
    "open": {
      "type": "boolean",
      "description": "Helper value. Is this assignment currently open? Based on the value of the ends field."
    },
    "receiptMessage": {
      "type": "string",
      "description": "An optional assignment specific message to be displayed on successful contribution submission. For example, this might be used to inform contributors of assignment specific moderation time frames."
    },
    "starts": {
      "type": "string",
      "format": "date-time"
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "id",
          "name"
        ],
        "properties": {
          "colour": {
            "type": "string",
            "description": "Optional HTML hexcode colour"
          },
          "id": {
            "type": "string"
          },
          "name": {
            "type": "string"
          },
          "tagSet": {
            "type": "object",
            "required": [
              "id",
              "name"
            ],
            "properties": {
              "id": {
                "type": "string"
              },
              "name": {
                "type": "string"
              }
            }
          },
          "urlWords": {
            "type": "string"
          }
        }
      }
    },
    "urlWords": {
      "type": "string"
    },
    "webUrl": {
      "type": "string"
    }
  }
}