Add initial setup files for Tailwind CSS and PostCSS, including global styles and TypeScript configuration

tailwind.config.ts

@@ -0,0 +1,23 @@
+import type { Config } from "tailwindcss";
+
+const config: Config = {
+  content: ["./app/**/*.{js,ts,jsx,tsx,mdx}"],
+  theme: {
+    extend: {
+      colors: {
+        ink: "#17211f",
+        mist: "#f5f7f4",
+        leaf: "#2f7d63",
+        coral: "#d8644a",
+        sun: "#e3aa38",
+        sky: "#4f7fbf",
+      },
+      boxShadow: {
+        soft: "0 18px 50px rgba(23, 33, 31, 0.08)",
+      },
+    },
+  },
+  plugins: [],
+};
+
+export default config;