Added lsp_signature global configuration.

lua/lsp_signature/init.lua

@@ -0,0 +1,9 @@
+require'lsp_signature'.on_attach({
+        bind = true,
+        floating_window = true,
+        hint_enable = true,
+        fix_pos = true,
+        handler_opts = {
+          border = "single"   -- double, single, shadow, none
+        },
+    })