Add coc basic config, not fully working yet

nvim-coc/lua/plugins/utility/markdown-preview.lua

@@ -0,0 +1,17 @@
+return {
+    -- literally the name, previews md in browser
+    "iamcco/markdown-preview.nvim",
+    cmd = { "MarkdownPreviewToggle", "MarkdownPreview", "MarkdownPreviewStop" },
+    ft = { "markdown" },
+    build = function(plugin)
+      if vim.fn.executable "npx" then
+        vim.cmd("!cd " .. plugin.dir .. " && cd app && npx --yes yarn install")
+      else
+        vim.cmd [[Lazy load markdown-preview.nvim]]
+        vim.fn["mkdp#util#install"]()
+      end
+    end,
+    init = function()
+      if vim.fn.executable "npx" then vim.g.mkdp_filetypes = { "markdown" } end
+    end,
+}