test: add bad markdown to verify linter failure

Author: EmersonFras

lint-fail-test.md

@@ -0,0 +1,13 @@
+# Invalid Header with Punctuation.
+
+#BadHeader formatting (No space after hash)
+
+* Level 1 item
+  * Level 2 item (This uses 2 spaces, but your config demands 4)
+
+This line has trailing spaces at the end.   
+
+<br>
+
+
+(The blank lines above violate MD012)