Add a contribution to the database

{"elements":[{"isDiscrete":false,"hidden":false,"name":"url","readOnly":false,"id":252043817,"type":"textFieldElement"},{"isDiscrete":false,"hidden":false,"name":"name","readOnly":false,"id":252043838,"type":"textFieldElement"},{"isDiscrete":false,"hidden":false,"name":"email","readOnly":false,"id":252043955,"type":"emailElement"},{"isDiscrete":false,"hidden":false,"name":"knowledge","readOnly":false,"id":252043910,"type":"textBoxElement"},{"isDiscrete":true,"hidden":true,"values":[{"text":"Yes","value":"0-yes"}],"name":"added","readOnly":false,"id":521897561,"type":"checkboxElement"}]}