feat: initial repo scaffolding

Port in some older solutions I've written just to
get the structure established and in place.

vitest.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    coverage: {
+      provider: 'v8',
+      reporter: ['text'],
+      include: ['src/**/*.ts'],
+      exclude: ['src/**/*.spec.ts'],
+      thresholds: {
+        statements: 100,
+        branches: 100,
+        functions: 100,
+        lines: 100,
+      },
+    },
+  },
+})