add auto run gulp task

.gitignore

+node_modules/
+.wing/
+fe_wxgame/
\ No newline at end of file

gulpfile.js

+var gulp = require('gulp')
+var run = require('gulp-run-command').default
+ 
+gulp.task("build", run(["egret run ./fe"]));
+
+gulp.task(`watch`, () => {
+    gulp.watch('./fe/**/**.*', [`build`])
+})

package.json

+{
+  "name": "fe",
+  "version": "1.0.0",
+  "description": "",
+  "main": "gulpfile.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "gulp": "^3.9.1",
+    "gulp-run-command": "0.0.9",
+  }
+}