chore: import upstream snapshot with attribution

tools/challenge-parser/parser/__fixtures__/parse-fixture.js

@@ -0,0 +1,13 @@
+const { join } = require('path');
+const remark = require('remark');
+const directive = require('remark-directive');
+const frontmatter = require('remark-frontmatter');
+const { read } = require('to-vfile');
+
+const parseFixture = async (filename) => remark()
+  .use(directive)
+  .use(frontmatter, ['yaml'])
+  .parse(await read(join(__dirname, filename)));
+
+
+module.exports = parseFixture;