Add responses to surveys to export

src/data/survey_response.rs

@@ -0,0 +1,15 @@
+//! # Survey response
+//!
+//! This structure contains information about a single response to a survey
+//!
+//! @author Pierre Hubert
+
+use crate::data::user::UserID;
+
+pub struct SurveyResponse {
+    pub id: u64,
+    pub time_sent: u64,
+    pub user_id: UserID,
+    pub survey_id: u64,
+    pub choice_id: u64
+}