Update with Emacs info (#43450)

* Update other_tools_and_programs with Emacs info

docs/docsite/rst/community/other_tools_and_programs.rst

@@ -21,6 +21,16 @@ changes, commit from the GUI, and see what branch you are on. You can customize
 * `language-yaml <https://github.com/atom/language-yaml>`_ - YAML highlighting for Atom.
 
 
+Emacs
+=====
+
+A free, open-source text editor and IDE that supports auto-indentation, syntax highlighting and built in terminal shell(among other things).
+
+* `yaml-mode <https://github.com/yoshiki/yaml-mode>`_ - YAML highlighting and syntax checking.
+* `inja2-mode <https://github.com/paradoxxxzero/jinja2-mode>`_ - Jinja2 highlighting and syntax checking.
+* `magit-mode <https://github.com/magit/magit>`_ -  Git porcelain within Emacs.
+
+
 PyCharm
 =======