Add logger and gitignore output.

Since the current workflow includes running files directly, SvelteKit's
$dev env won't work. Using Node envs directly.

.gitignore

@@ -8,6 +8,9 @@ node_modules
 /.svelte-kit
 /build
 
+# Logging
+*.log
+
 # Databases
 *.db
 

src/lib/server/logger.ts

@@ -0,0 +1,32 @@
+import pino from "pino";
+
+const prod = process.env.NODE_ENV === "production";
+
+const loggerConfig: Record<string, pino.LoggerOptions> = {
+  prod: {
+    level: "info",
+  },
+  dev: {
+    level: "debug",
+    transport: {
+      targets: [
+        {
+          target: "pino-pretty",
+          options: {
+            colorize: true,
+          },
+        },
+        {
+          target: "pino/file",
+          options: {
+            destination: "./logs/dev.log",
+            mkdir: true,
+          },
+        },
+      ],
+    },
+  },
+};
+const logger = pino(prod ? loggerConfig.prod : loggerConfig.dev);
+
+export default logger;