[#6]: Add shellcheck, reformat structure

nvim/lua/plugins/lang/markdown.lua

@@ -0,0 +1,41 @@
+return {
+  {
+    "williamboman/mason.nvim",
+    opts = function(_, opts)
+      opts.ensure_installed = opts.ensure_installed or {}
+      vim.list_extend(opts.ensure_installed, {
+        "marksman",
+        "mdformat",
+      })
+    end,
+  },
+  {
+    "nvimtools/none-ls.nvim",
+    opts = function(_, opts)
+      local nls = require("null-ls")
+      opts.sources = opts.sources or {}
+      vim.list_extend(opts.sources, {
+        nls.builtins.formatting.mdformat,
+      })
+    end,
+  },
+  {
+    "neovim/nvim-lspconfig",
+    opts = {
+      servers = {
+        marksman = {},
+      },
+    },
+  },
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      if type(opts.ensure_installed) == "table" then
+        vim.list_extend(opts.ensure_installed, {
+          "markdown",
+          "markdown_inline",
+        })
+      end
+    end,
+  },
+}