Add lsp_signature, update telescope

lua/plugins/lsp_signature.lua

@@ -0,0 +1,13 @@
+return {
+  "ray-x/lsp_signature.nvim",
+  event = "InsertEnter",
+  opts = {
+    bind = true,
+    handler_opts = {
+      border = "rounded"
+    },
+    hint_enable = false
+  },
+  -- or use config
+  -- config = function(_, opts) require'lsp_signature'.setup({you options}) end
+}