feat: support config

Author: pi0

README.md

@@ -40,6 +40,19 @@ By default, the `README.md` file in the current working directory will be used a
 
 You can use `--dir` and `--file` arguments to customize the default behavior to operate on any other markdown file.
 
+### Configuration
+
+You can specify configuration in `.automdrc` or `automd.config.{js,ts,cjs,mjs,json}` (powered by [unjs/c12](https://c12.unjs.io)).
+
+Example: `automd.config.js`
+
+```ts
+/** @type {import("automd").Config} */
+export default {
+  file: "DOCS.md",
+};
+```
+
 ### Programmatic API
 
 [WIP]

package.json

@@ -33,6 +33,7 @@
     "test:types": "tsc --noEmit --skipLibCheck"
   },
   "dependencies": {
+    "c12": "^1.6.1",
     "citty": "^0.1.5",
     "consola": "^3.2.3",
     "destr": "^2.0.2",

playground/automd.config.ts

@@ -0,0 +1,2 @@
+/** @type {import("automd").Config} */
+export default {}