Add formatting style Markdown

tests/test_formatting.py

@@ -0,0 +1,14 @@
+import chevron
+
+from papis_extract.annotation_data import Markdown
+
+def test_markdown_default():
+    fmt = Markdown()
+    assert chevron.render(fmt.string, {
+        "file": "somefile/somewhere.pdf",
+        "quote": "I am quote",
+        "note": "and including note.",
+        "page": 46,
+        "tag": "important",
+        "type": "highlight",
+    }) == "#important\n> I am quote [p. 46]\n  NOTE: and including note."