resolves #74 add basic support for footnotes

CHANGELOG.adoc

@@ -11,6 +11,7 @@ For a detailed view of what has changed, refer to the {uri-repo}/commits/master[
 
 * Add support for converting block LaTeX math to stem block
 * Add support for converting span LaTeX math to inline stem macro
+* Add basic support for footnotes (#74)
 
 === Fixed
 

lib/kramdown-asciidoc/converter.rb

@@ -529,6 +529,10 @@ def convert_entity el, opts
       opts[:writer].append RESOLVE_ENTITY_TABLE[el.value.code_point] || el.options[:original]
     end
 
+    def convert_footnote el, opts
+      opts[:writer].append %(footnote:#{el.options[:name]}[#{(compose_text el.value).gsub ']', '\]'}])
+    end
+
     def convert_smart_quote el, opts
       opts[:writer].append SMART_QUOTE_ENTITY_TO_MARKUP[el.value]
     end

spec/scenarios/footnote/single.adoc

@@ -0,0 +1,2 @@
+By default, `HashMap` uses a hashing function called SipHashfootnote:siphash[https://en.wikipedia.org/wiki/SipHash] that can provide
+resistance to Denial of Service (DoS) attacks involving hash tables.

spec/scenarios/footnote/single.md

@@ -0,0 +1,4 @@
+By default, `HashMap` uses a hashing function called SipHash[^siphash] that can provide 
+resistance to Denial of Service (DoS) attacks involving hash tables.
+
+[^siphash]: [https://en.wikipedia.org/wiki/SipHash](https://en.wikipedia.org/wiki/SipHash)