Initial Map page (#26450)

* Initial Map page

* Update index.md

guide/english/elixir/maps/index.md

@@ -3,11 +3,30 @@ title: Maps
 ---
 ## Maps
 
-This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/elixir/maps/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+Maps is the Elixir data structure for key-values.
+They are not ordered and allow keys of any type.
+Maps are created using the %{} syntax:
 
-<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+```
+iex(1)> %{}
+%{}
+iex(2)> %{1 => "one", 2 => "two", 3 => "three"}
+%{1 => "one", 2 => "two", 3 => "three"}
 
-<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+```
+
+Maps can be accessed with `Map.get/3` or `Map.fetch/2` or with through the `map[]` syntax:
+```
+iex(1)> map=%{1 => "one", 2 => "two"}
+%{1 => "one", 2 => "two"}
+iex(2)> Map.fetch(map, 1)
+{:ok, "one"}
+iex(3)> map[2]
+"two"
+iex(4)> map[5]
+nil
+
+```
 
 #### More Information:
-<!-- Please add any articles you think might be helpful to read before writing the article -->
+[HexDocs](https://hexdocs.pm/elixir/Map.html)