Revert "remove roslyn"

This reverts commit 1d5b00c987.

nvim/.config/nvim/init.lua

@@ -612,6 +612,20 @@ require'lazy'.setup{ --{{{1
             },
         },
     },
+    { "seblyng/roslyn.nvim", --{{{2
+        opts = {
+            ---function to pick which .sln file to use when opening a cs file
+            ---@param targets string[]
+            choose_target=function (targets)
+                if targets == nil then return end
+                if #targets == 0 then return end
+                table.sort(targets, function(a, b)
+                    return #a < #b
+                end)
+                return targets[1]
+            end
+        },
+    },
     { 'neovim/nvim-lspconfig', --{{{2
         dependencies = {
             'williamboman/mason.nvim',