feat(motion): add tabout.nvim (#722)

lua/astrocommunity/motion/tabout-nvim/README.md

@@ -0,0 +1,5 @@
+# tabout.nvim
+
+tabout plugin for neovim
+
+**Repository:** <https://github.com/abecodes/tabout.nvim>

lua/astrocommunity/motion/tabout-nvim/init.lua

@@ -0,0 +1,23 @@
+return {
+  "abecodes/tabout.nvim",
+  event = "InsertEnter",
+  dependencies = {
+    "nvim-treesitter/nvim-treesitter",
+    {
+      "hrsh7th/nvim-cmp",
+      opts = function(_, opts)
+        local cmp, luasnip = require "cmp", require "luasnip"
+        opts.mapping["<Tab>"] = cmp.mapping(function(fallback)
+          if cmp.visible() then
+            cmp.select_next_item()
+          elseif luasnip.expand_or_jumpable() then
+            luasnip.expand_or_jump()
+          else
+            fallback()
+          end
+        end, { "i", "s" })
+      end,
+    },
+  },
+  opts = {},
+}