Add C# language integration

config.org

@@ -935,6 +935,22 @@
      (add-hook 'python-mode-hook #'lsp-deferred)
    #+end_src
 
+** C#
+   I hate the .NET ecosystem quite a lot, but alas: sometimes I have
+   to use it at work.
+
+   Using =csharp-mode= for basic support:
+
+   #+begin_src emacs-lisp
+     (use-package csharp-mode)
+   #+end_src
+
+   And =lsp-mode= for the rest (using the omnisharp server):
+
+   #+begin_src emacs-lisp
+     (add-hook 'csharp-mode-hook #'lsp-deferred)
+   #+end_src
+
 * Tool Integrations
 ** Git
    =magit= is truly a wonderful creation! Add keybinding for