nvim: Add simple LLM assisted programming

Added codecompanion as a test for LLM assistance during programming.
Will see how much I end up using it.

nvim/.config/nvim/lua/plugins/llm.lua

@@ -0,0 +1,49 @@
+return {
+	-- TODO: Add completion w blink, see https://codecompanion.olimorris.dev/installation.html
+	{
+		"olimorris/codecompanion.nvim",
+		dependencies = {
+			"nvim-lua/plenary.nvim",
+			"nvim-treesitter/nvim-treesitter",
+			"github/copilot.vim",
+		},
+		opts = {
+			strategies = {
+				chat = { adapter = "groq" },
+				inline = { adapter = "groq" },
+			},
+			adapters = {
+				groq = function()
+					return require("codecompanion.adapters").extend("openai", {
+						env = {
+							api_key = "GROQ_API_KEY",
+						},
+						name = "Groq",
+						url = "https://api.groq.com/openai/v1/chat/completions",
+						schema = {
+							model = {
+								default = "llama-3.1-8b-instant",
+								choices = {
+									"llama-3.3-70b-versatile",
+									"mixtral-8x7b-32768",
+								},
+							},
+						},
+						max_tokens = {
+							default = 4096,
+						},
+						temperature = {
+							default = 1,
+						},
+					})
+				end,
+			},
+		},
+		keys = {
+			{ "<leader>aa", "<cmd>CodeCompanionActions<cr>", desc = "Actions", silent = true, mode = { "n", "v" } },
+			{ "<leader>ac", "<cmd>CodeCompanionChat Toggle<cr>", desc = "Toggle chat", silent = true },
+			{ "<leader>ac", "<cmd>CodeCompanionChat Add<cr>", desc = "Add to chat", silent = true, mode = "v" },
+		},
+		cmd = { "CodeCompanionActions", "CodeCompanionChat", "CodeCompanion", "CodeCompanionCmd" },
+	},
+}