added devdocs plugin

lua/plugins/nvim-devdocs.lua

@@ -0,0 +1,10 @@
+return {
+  'luckasRanarison/nvim-devdocs',
+  dependencies = {
+    'nvim-lua/plenary.nvim',
+    'nvim-telescope/telescope.nvim',
+    'nvim-treesitter/nvim-treesitter',
+  },
+  branch = 'master',
+  opts = {}
+}