feat(nvim): add copilot-chat plugin

.config/nvim/lua/specs/copilot-chat.lua

@@ -0,0 +1,44 @@
+local Plugin = { 'CopilotC-Nvim/CopilotChat.nvim' }
+
+Plugin.name = 'copilot-chat'
+
+Plugin.opts = {
+  model = 'gpt-4o',
+  question_header = '# ',
+  answer_header = '# ',
+  error_header = '# ',
+  separator = ' ',
+  show_folds = false,
+  show_help = false,
+  window = {
+    layout = 'float',
+    width = 0.7,
+    height = 0.8,
+  },
+  mappings = {
+    complete = {
+      insert = '',
+    },
+  },
+}
+
+Plugin.config = function(_, opts)
+  local copilot = require('CopilotChat')
+  local copilot_select = require('CopilotChat.select')
+
+  copilot.setup(opts)
+
+  local keymap = vim.keymap
+
+  keymap.set({ 'n', 'x' }, '<Space>cn', function()
+    local input = vim.fn.input('Quick Chat: ')
+
+    if input ~= '' then
+      copilot.ask(input, { selection = copilot_select.buffer })
+    end
+  end)
+
+  keymap.set('n', '<Space>cf', vim.cmd.CopilotChatToggle)
+end
+
+return Plugin