feat(runner): add readme command

libs/file.js

@@ -15,7 +15,7 @@ export async function read(filePath, encoding = 'utf8') {
   return await fsP.readFile(filePath, encoding, { flag: 'r' })
 }
 
-export async function readSync(filePath, encoding = 'utf8') {
+export function readSync(filePath, encoding = 'utf8') {
   return fs.readFileSync(filePath, encoding, { flag: 'r' })
 }
 
@@ -50,6 +50,6 @@ export async function copy(sourcePath, targetPath) {
   return await fsP.copyFile(sourcePath, targetPath)
 }
 
-function append(content, filePath) {
-  
+export function appendSync(content, filePath) {
+  return fs.appendFileSync(filePath, content, 'utf8');
 }