Add md-footnote

crates/lib/md-footnote/tests/fixtures/0.md

@@ -0,0 +1,31 @@
+Basic test
+
+......
+
+[^a]
+[^a]
+
+[^a]: Multi
+line
+
+    Multi-paragraph
+
+[^a]: duplicate
+
+normal paragraph
+
+......
+
+<p data-sourcepos="1:1-2:4"><sup data-sourcepos="1:1-1:4" class="footnote-ref"><a href="#fn1" id="fnref1">[1]</a></sup>
+<sup data-sourcepos="2:1-2:4" class="footnote-ref"><a href="#fn1" id="fnref2">[1]</a></sup></p>
+<p data-sourcepos="11:1-11:16">normal paragraph</p>
+<hr class="footnotes-sep">
+<section class="footnotes">
+<ol class="footnotes-list">
+<li data-sourcepos="4:1-8:0" id="fn1" class="footnote-item">
+<p data-sourcepos="4:7-5:4">Multi
+line</p>
+<p data-sourcepos="7:5-7:19">Multi-paragraph <a href="#fnref1" class="footnote-backref">↩︎</a> <a href="#fnref2" class="footnote-backref">↩︎</a></p>
+</li>
+</ol>
+</section>