chore: import upstream snapshot with attribution

tools/challenge-parser/parser/plugins/add-assignment.js

@@ -0,0 +1,24 @@
+const { getSection } = require('./utils/get-section');
+
+const { createMdastToHtml } = require('./utils/i18n-stringify');
+const { splitOnThematicBreak } = require('./utils/split-on-thematic-break');
+
+function plugin() {
+  return transformer;
+
+  function transformer(tree, file) {
+    const toHtml = createMdastToHtml(file.data.lang);
+    const assignmentNodes = getSection(tree, '--assignment--');
+
+    function getAssignments(assignmentNodes) {
+      const assignmentGroups = splitOnThematicBreak(assignmentNodes);
+      return assignmentGroups.map(assignment => toHtml(assignment));
+    }
+
+    file.data.assignments = getAssignments(assignmentNodes).filter(
+      a => a != ''
+    );
+  }
+}
+
+module.exports = plugin;