Populate render context for footnote references.

src/context/footnote_reference.rs

@@ -9,15 +9,23 @@ use crate::intermediate::IFootnoteReference;
 #[derive(Debug, Serialize)]
 #[serde(tag = "type")]
 #[serde(rename = "footnote_reference")]
-pub(crate) struct RenderFootnoteReference {}
+pub(crate) struct RenderFootnoteReference {
+    reference_id: String,
+    definition_link: String,
+    label: String,
+}
 
 impl RenderFootnoteReference {
     pub(crate) fn new(
         config: &Config,
         output_directory: &Path,
         output_file: &Path,
-        comment: &IFootnoteReference,
+        original: &IFootnoteReference,
     ) -> Result<RenderFootnoteReference, CustomError> {
-        Ok(RenderFootnoteReference {})
+        Ok(RenderFootnoteReference {
+            reference_id: original.get_reference_id(),
+            definition_link: format!("#{}", original.get_definition_id()),
+            label: original.get_display_label(),
+        })
     }
 }