feat(neovim): add csharp support

modules/home-manager/programs/neovim/lua/plugins/none-ls.lua

@@ -16,10 +16,11 @@ return {
     config.sources = {
       -- Set a formatter
       require("none-ls.diagnostics.flake8"),
+      require("none-ls.formatting.ruff"),
       null_ls.builtins.formatting.clang_format,
+      null_ls.builtins.formatting.csharpier,
       null_ls.builtins.formatting.nixfmt,
       null_ls.builtins.formatting.prettier,
-      require("none-ls.formatting.ruff"),
       null_ls.builtins.formatting.stylua,
     }
     return config -- return final config table

modules/home-manager/programs/neovim/lua/plugins/treesitter.lua

@@ -8,6 +8,7 @@ return {
     opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, {
       -- Programming
       "c",
+      "c_sharp",
       "cmake",
       "cpp",
       "css",