feat: add markdown-oxide lsp

lua/lspconfig/server_configurations/markdown_oxide.lua

@@ -0,0 +1,18 @@
+return {
+  default_config = {
+    root_dir = function()
+      return vim.fn.getcwd()
+    end, -- this is applicable because markdown vaults have no defined root files
+    filetypes = { 'markdown' },
+    cmd = { 'markdown-oxide' },
+  },
+  docs = {
+    description = [[
+https://github.com/Feel-ix-343/markdown-oxide
+
+Markdown language server with advanced linking support made to be completely compatible with Obsidian; An Obsidian Language Server
+
+Check the readme to see how to get nvim-cmp properly working.
+    ]]
+  }
+}