feat(lsp): add ray-x/lsp_signature.nvim

lua/astrocommunity/lsp/lsp-signature-nvim/README.md

@@ -0,0 +1,7 @@
+# lsp_signature.nvim
+
+**Repository:** <https://github.com/ray-x/lsp_signature.nvim>
+
+Show function signature when you type.
+
+Additional hint is visually distracting therefore "hint_enable" option is set to false.

lua/astrocommunity/lsp/lsp-signature-nvim/init.lua

@@ -0,0 +1,9 @@
+return {
+  "neovim/nvim-lspconfig",
+  dependencies = {
+    "ray-x/lsp_signature.nvim",
+    opts = {
+      hint_enable = false, -- disable hints as it will crash in some terminal
+    },
+  },
+}