Add omnisharp support for c#

* eglot.el (eglot-server-programs): Add omnisharp for C#.
* README.md: Document the above change.

Copyright-paperwork-exempt: Yes
GitHub-reference: close https://github.com/joaotavora/eglot/issues/897

diff --git a/lisp/progmodes/eglot.el b/lisp/progmodes/eglot.el
index 83a29455147eeef9052a4ded8ab898422fe4c2f2..1c16240890519170c8023ea3c4b4e3a704e7e83c 100644 (file)
--- a/lisp/progmodes/eglot.el
+++ b/lisp/progmodes/eglot.el
@@ -192,7 +192,8 @@ language-server/bin/php-language-server.php"))
                                 (html-mode . ,(eglot-alternatives '(("vscode-html-language-server" "--stdio") ("html-languageserver" "--stdio"))))
                                 (json-mode . ,(eglot-alternatives '(("vscode-json-language-server" "--stdio") ("json-languageserver" "--stdio"))))
                                 (dockerfile-mode . ("docker-langserver" "--stdio"))
-                                (clojure-mode . ("clojure-lsp")))
+                                (clojure-mode . ("clojure-lsp"))
+                                (csharp-mode . ("omnisharp" "-lsp")))
   "How the command `eglot' guesses the server to start.
 An association list of (MAJOR-MODE . CONTACT) pairs.  MAJOR-MODE
 identifies the buffers that are to be managed by a specific