Add treesitter plugin

lua/custom/plugins/treesitter.lua

@@ -0,0 +1,14 @@
+return {
+  "nvim-treesitter/nvim-treesitter",
+  -- open this plugin on two events:
+  -- BufReadPre - open existing file
+  -- BufNewFile - open new file
+  event = { "BufReadPre", "BufNewFile" },
+  build = ":TSUpdate",      -- Run whenever this plugin is installed or updated
+  dependencies = {
+    "windwp/nvim-ts-autotag", -- Auto-closing functionality within treesitter
+  },
+  config = function()
+    require "custom/treesitter"
+  end,
+}

lua/custom/treesitter.lua

@@ -0,0 +1,17 @@
+require'nvim-treesitter.configs'.setup {
+  ensure_installed = {
+    "python",
+    "lua",
+    "vim",
+    "vimdoc",
+    "query",
+    "elixir",
+    "heex",
+    "javascript",
+    "html",
+    "go"
+  },
+  sync_install = false,
+  highlight = { enable = true },
+  indent = { enable = true },
+}