Add .livemd extension to Markdown language (#5672)

* Add `.livemd` extension to `Markdown` language * Correct order Co-authored-by: Colin Seymour <colin@github.com>
github-linguist · May 25, 2022 · 7503f75 · 7503f75
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diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
@@ -3705,6 +3705,7 @@ Markdown:
   wrap: true
   extensions:
   - ".md"
+  - ".livemd"
   - ".markdown"
   - ".mdown"
   - ".mdwn"

diff --git a/samples/Markdown/livebook.livemd b/samples/Markdown/livebook.livemd
@@ -0,0 +1,22 @@
+<!-- livebook:{"persist_outputs":true} -->
+
+# Sample Livebook
+
+## Section
+
+### Markdown
+
+Notebooks are .livemd files, a subset of Markdown with support for equations and annotations.
+
+<!-- livebook:{"livebook_object":"cell_input","name":"plus","type":"number","value":"1"} -->
+
+```elixir
+{plus, _} = IO.gets("plus") |> Integer.parse()
+
+[1, 2, 3]
+|> Enum.map(&(&1 + plus))
+```
+
+```output
+[2, 3, 4]
+```